diff --git a/aegisub/src/audio_controller.cpp b/aegisub/src/audio_controller.cpp
index 2e49dd0c3..8c567100d 100644
--- a/aegisub/src/audio_controller.cpp
+++ b/aegisub/src/audio_controller.cpp
@@ -292,18 +292,14 @@ void AudioController::OpenAudio(const wxString &url)
 		/*
 		 * Assume it's not a URI but instead a filename in the platform's native format.
 		 */
-		wxFileName fn(url);
-		if (!fn.FileExists())
-		{
-			config::mru->Remove("Audio", STD_STR(url));
-			agi::FileNotFoundError fnf(STD_STR(url));
-			throw agi::AudioOpenError(
-				"Failed opening audio file (parsing as plain filename)",
-				&fnf);
+		try {
+			provider = AudioProviderFactory::GetProvider(url);
+			StandardPaths::SetPathValue("?audio", wxFileName(url).GetPath());
+		}
+		catch (...) {
+			config::mru->Remove("Audio", STD_STR(url));
+			throw;
 		}
-		provider = AudioProviderFactory::GetProvider(url);
-
-		StandardPaths::SetPathValue("?audio", fn.GetPath());
 	}
 
 	try
diff --git a/aegisub/src/audio_controller.h b/aegisub/src/audio_controller.h
index 98e8ca758..ba3af635e 100644
--- a/aegisub/src/audio_controller.h
+++ b/aegisub/src/audio_controller.h
@@ -445,6 +445,27 @@ public:
 };
 
 namespace agi {
-	DEFINE_BASE_EXCEPTION(AudioControllerError, Exception)
-	DEFINE_SIMPLE_EXCEPTION(AudioOpenError, AudioControllerError, "audio_controller/open_failed")
+	/// Base class for all audio-related errors
+	DEFINE_BASE_EXCEPTION(AudioError, Exception)
+
+	/// Opening the audio failed for any reason
+	DEFINE_SIMPLE_EXCEPTION(AudioOpenError, AudioError, "audio/open")
+
+	/// There are no audio providers available to open audio files
+	DEFINE_SIMPLE_EXCEPTION(NoAudioProvidersError, AudioOpenError, "audio/open/no_providers")
+
+	/// The file exists, but no providers could find any audio tracks in it
+	DEFINE_SIMPLE_EXCEPTION(AudioDataNotFoundError, AudioOpenError, "audio/open/no_tracks")
+
+	/// There are audio tracks, but no provider could actually read them
+	DEFINE_SIMPLE_EXCEPTION(AudioProviderOpenError, AudioOpenError, "audio/open/provider")
+
+	/// The audio cache failed to initialize
+	DEFINE_SIMPLE_EXCEPTION(AudioCacheOpenError, AudioOpenError, "audio/open/cache")
+
+	/// There are no audio players available
+	DEFINE_SIMPLE_EXCEPTION(NoAudioPlayersError, AudioOpenError, "audio/open/no_players")
+
+	/// The audio player failed to initialize
+	DEFINE_SIMPLE_EXCEPTION(AudioPlayerOpenError, AudioOpenError, "audio/open/player")
 }
diff --git a/aegisub/src/audio_player.cpp b/aegisub/src/audio_player.cpp
index 49634efeb..c7975c8df 100644
--- a/aegisub/src/audio_player.cpp
+++ b/aegisub/src/audio_player.cpp
@@ -55,6 +55,8 @@
 #ifdef WITH_LIBPULSE
 #include "audio_player_pulse.h"
 #endif
+
+#include "audio_controller.h"
 #include "compat.h"
 #include "main.h"
 
@@ -70,38 +72,20 @@ AudioPlayer::~AudioPlayer() {
 	CloseStream();
 }
 
-/// @brief Ask to stop later 
-void AudioPlayer::RequestStop() {
-	wxCommandEvent event(wxEVT_STOP_AUDIO, 1000);
-	event.SetEventObject(this);
-	AddPendingEvent(event); // thread safe
-}
-
-DEFINE_EVENT_TYPE(wxEVT_STOP_AUDIO)
-
-BEGIN_EVENT_TABLE(AudioPlayer, wxEvtHandler)
-	EVT_COMMAND (1000, wxEVT_STOP_AUDIO, AudioPlayer::OnStopAudio)
-END_EVENT_TABLE()
-
-void AudioPlayer::OnStopAudio(wxCommandEvent &) {
-	Stop(false);
-}
-
 AudioPlayer* AudioPlayerFactory::GetAudioPlayer() {
 	std::vector<std::string> list = GetClasses(OPT_GET("Audio/Player")->GetString());
-	if (list.empty()) throw "No audio players are available.";
+	if (list.empty()) throw agi::NoAudioPlayersError("No audio players are available.", 0);
 
-	wxString error;
-	for (unsigned int i=0;i<list.size();i++) {
+	std::string error;
+	for (size_t i = 0; i < list.size(); ++i) {
 		try {
-			AudioPlayer *player = Create(list[i]);
-			if (player) return player;
+			return Create(list[i]);
+		}
+		catch (agi::AudioPlayerOpenError const& err) {
+			error += list[i] + " factory: " + err.GetChainedMessage() + "\n";
 		}
-		catch (wxString err) { error += list[i] + " factory: " + err + "\n"; }
-		catch (const wxChar *err) { error += list[i] + " factory: " + wxString(err) + "\n"; }
-		catch (...) { error += list[i] + " factory: Unknown error\n"; }
 	}
-	throw error;
+	throw agi::AudioPlayerOpenError(error, 0);
 }
 
 void AudioPlayerFactory::RegisterProviders() {
diff --git a/aegisub/src/audio_player_alsa.cpp b/aegisub/src/audio_player_alsa.cpp
index 055ada5ee..0f108e1d8 100644
--- a/aegisub/src/audio_player_alsa.cpp
+++ b/aegisub/src/audio_player_alsa.cpp
@@ -41,6 +41,8 @@
 #include <libaegisub/log.h>
 
 #include "audio_player_alsa.h"
+
+#include "audio_controller.h"
 #include "include/aegisub/audio_provider.h"
 #include "compat.h"
 #include "frame_main.h"
@@ -365,7 +367,7 @@ void AlsaPlayer::OpenStream()
 	}
 	else
 	{
-		throw 1; // FIXME
+		throw agi::AudioPlayerOpenError("AlsaPlayer: Creating the playback thread failed", 0);
 	}
 }
 
diff --git a/aegisub/src/audio_player_alsa.h b/aegisub/src/audio_player_alsa.h
index 167ec9746..8de886cc8 100644
--- a/aegisub/src/audio_player_alsa.h
+++ b/aegisub/src/audio_player_alsa.h
@@ -71,4 +71,3 @@ public:
 };
 
 #endif
-
diff --git a/aegisub/src/audio_player_dsound.cpp b/aegisub/src/audio_player_dsound.cpp
index f6bf33b00..aa67765e0 100644
--- a/aegisub/src/audio_player_dsound.cpp
+++ b/aegisub/src/audio_player_dsound.cpp
@@ -40,6 +40,7 @@
 
 #include <libaegisub/log.h>
 
+#include "audio_controller.h"
 #include "audio_player_dsound.h"
 #include "frame_main.h"
 #include "main.h"
@@ -75,7 +76,7 @@ void DirectSoundPlayer::OpenStream() {
 	// Initialize the DirectSound object
 	HRESULT res;
 	res = DirectSoundCreate8(&DSDEVID_DefaultPlayback,&directSound,NULL); // TODO: support selecting audio device
-	if (FAILED(res)) throw "Failed initializing DirectSound";
+	if (FAILED(res)) throw agi::AudioPlayerOpenError("Failed initializing DirectSound", 0);
 
 	// Set DirectSound parameters
 	directSound->SetCooperativeLevel((HWND)wxGetApp().frame->GetHandle(),DSSCL_PRIORITY);
@@ -106,11 +107,11 @@ void DirectSoundPlayer::OpenStream() {
 	// Create the buffer
 	IDirectSoundBuffer *buf;
 	res = directSound->CreateSoundBuffer(&desc,&buf,NULL);
-	if (res != DS_OK) throw "Failed creating DirectSound buffer";
+	if (res != DS_OK) throw agi::AudioPlayerOpenError("Failed creating DirectSound buffer", 0);
 
 	// Copy interface to buffer
 	res = buf->QueryInterface(IID_IDirectSoundBuffer8,(LPVOID*) &buffer);
-	if (res != S_OK) throw "Failed casting interface to IDirectSoundBuffer8";
+	if (res != S_OK) throw agi::AudioPlayerOpenError("Failed casting interface to IDirectSoundBuffer8", 0);
 
 	// Set data
 	offset = 0;
diff --git a/aegisub/src/audio_player_dsound2.cpp b/aegisub/src/audio_player_dsound2.cpp
index 2ee4014a4..970a68d36 100644
--- a/aegisub/src/audio_player_dsound2.cpp
+++ b/aegisub/src/audio_player_dsound2.cpp
@@ -48,6 +48,7 @@
 
 #include "audio_player_dsound2.h"
 
+#include "audio_controller.h"
 #include "include/aegisub/audio_provider.h"
 #include "frame_main.h"
 #include "main.h"
@@ -669,7 +670,7 @@ DirectSoundPlayer2Thread::DirectSoundPlayer2Thread(AudioProvider *provider, int
 	thread_handle.handle = (HANDLE)_beginthreadex(0, 0, ThreadProc, this, 0, 0);
 
 	if (!thread_handle)
-		throw "Failed creating playback thread in DirectSoundPlayer2. This is bad.";
+		throw agi::AudioPlayerOpenError("Failed creating playback thread in DirectSoundPlayer2. This is bad.", 0);
 
 	HANDLE running_or_error[] = { thread_running, error_happened };
 	switch (WaitForMultipleObjects(2, running_or_error, FALSE, INFINITE))
@@ -680,10 +681,10 @@ DirectSoundPlayer2Thread::DirectSoundPlayer2Thread(AudioProvider *provider, int
 
 	case WAIT_OBJECT_0 + 1:
 		// error happened, we fail
-		throw error_message;
+		throw agi::AudioPlayerOpenError(error_message, 0);
 
 	default:
-		throw "Failed wait for thread start or thread error in DirectSoundPlayer2. This is bad.";
+		throw agi::AudioPlayerOpenError("Failed wait for thread start or thread error in DirectSoundPlayer2. This is bad.", 0);
 	}
 }
 
@@ -714,7 +715,7 @@ void DirectSoundPlayer2Thread::Play(int64_t start, int64_t count)
 	case WAIT_OBJECT_0+1: // Error
 		throw error_message;
 	default:
-		throw "Unexpected result from WaitForMultipleObjects in DirectSoundPlayer2Thread::Play";
+		throw agi::InternalError("Unexpected result from WaitForMultipleObjects in DirectSoundPlayer2Thread::Play", 0);
 	}
 }
 
diff --git a/aegisub/src/audio_player_openal.cpp b/aegisub/src/audio_player_openal.cpp
index 99f222ece..6b6660d9e 100644
--- a/aegisub/src/audio_player_openal.cpp
+++ b/aegisub/src/audio_player_openal.cpp
@@ -42,6 +42,7 @@
 
 #include "audio_player_openal.h"
 
+#include "audio_controller.h"
 #include "utils.h"
 
 // Auto-link to OpenAL lib for MSVC
@@ -49,6 +50,8 @@
 #pragma comment(lib, "openal32.lib")
 #endif
 
+DEFINE_SIMPLE_EXCEPTION(OpenALException, agi::AudioPlayerOpenError, "audio/open/player/openal")
+
 OpenALPlayer::OpenALPlayer()
 : open(false)
 , playing(false)
@@ -76,25 +79,25 @@ void OpenALPlayer::OpenStream()
 	try {
 		// Open device
 		device = alcOpenDevice(0);
-		if (!device) throw OpenALException("Failed opening default OpenAL device");
+		if (!device) throw OpenALException("Failed opening default OpenAL device", 0);
 
 		// Create context
 		context = alcCreateContext(device, 0);
-		if (!context) throw OpenALException("Failed creating OpenAL context");
-		if (!alcMakeContextCurrent(context)) throw OpenALException("Failed selecting OpenAL context");
+		if (!context) throw OpenALException("Failed creating OpenAL context", 0);
+		if (!alcMakeContextCurrent(context)) throw OpenALException("Failed selecting OpenAL context", 0);
 
 		// Clear error code
 		alGetError();
 
 		// Generate buffers
 		alGenBuffers(num_buffers, buffers);
-		if (alGetError() != AL_NO_ERROR) throw OpenALException("Error generating OpenAL buffers");
+		if (alGetError() != AL_NO_ERROR) throw OpenALException("Error generating OpenAL buffers", 0);
 
 		// Generate source
 		alGenSources(1, &source);
 		if (alGetError() != AL_NO_ERROR) {
 			alDeleteBuffers(num_buffers, buffers);
-			throw OpenALException("Error generating OpenAL source");
+			throw OpenALException("Error generating OpenAL source", 0);
 		}
 	}
 	catch (...)
diff --git a/aegisub/src/audio_player_openal.h b/aegisub/src/audio_player_openal.h
index 07b054552..daa5c5574 100644
--- a/aegisub/src/audio_player_openal.h
+++ b/aegisub/src/audio_player_openal.h
@@ -53,10 +53,6 @@
 #include <vector>
 #endif
 
-#include <libaegisub/exception.h>
-
-DEFINE_SIMPLE_EXCEPTION_NOINNER(OpenALException, agi::Exception, "audio/player/openal/generic")
-
 /// DOCME
 /// @class OpenALPlayer
 /// @brief DOCME
diff --git a/aegisub/src/audio_player_oss.cpp b/aegisub/src/audio_player_oss.cpp
index c2f6e59d2..e02b7fd60 100644
--- a/aegisub/src/audio_player_oss.cpp
+++ b/aegisub/src/audio_player_oss.cpp
@@ -43,11 +43,16 @@
 #include <libaegisub/log.h>
 
 #include "audio_player_oss.h"
-#include "frame_main.h"
+
+#include "audio_controller.h"
 #include "compat.h"
+#include "include/aegisub/audio_provider.h"
 #include "main.h"
 #include "utils.h"
 
+DEFINE_SIMPLE_EXCEPTION(OSSError, agi::AudioPlayerOpenError, "audio/player/open/oss")
+
+
 /// @brief Constructor 
 ///
 OSSPlayer::OSSPlayer()
@@ -81,7 +86,7 @@ void OSSPlayer::OpenStream()
     wxString device = lagi_wxString(OPT_GET("Audio/OSS/Device")->GetString());
     dspdev = ::open(device.mb_str(wxConvUTF8), O_WRONLY, 0);
     if (dspdev < 0) {
-        throw OSSError("OSS player: opening device failed");
+        throw OSSError("OSS player: opening device failed", 0);
     }
 
     // Use a reasonable buffer policy for low latency (OSS4)
@@ -93,7 +98,7 @@ void OSSPlayer::OpenStream()
     // Set number of channels
     int channels = provider->GetChannels();
     if (ioctl(dspdev, SNDCTL_DSP_CHANNELS, &channels) < 0) {
-        throw OSSError("OSS player: setting channels failed");
+        throw OSSError("OSS player: setting channels failed", 0);
     }
 
     // Set sample format
@@ -106,17 +111,17 @@ void OSSPlayer::OpenStream()
             sample_format = AFMT_S16_LE;
             break;
         default:
-            throw OSSError("OSS player: can only handle 8 and 16 bit sound");
+            throw OSSError("OSS player: can only handle 8 and 16 bit sound", 0);
     }
 
     if (ioctl(dspdev, SNDCTL_DSP_SETFMT, &sample_format) < 0) {
-        throw OSSError("OSS player: setting sample format failed");
+        throw OSSError("OSS player: setting sample format failed", 0);
     }
 
     // Set sample rate
     rate = provider->GetSampleRate();
     if (ioctl(dspdev, SNDCTL_DSP_SPEED, &rate) < 0) {
-        throw OSSError("OSS player: setting samplerate failed");
+        throw OSSError("OSS player: setting samplerate failed", 0);
     }
 
     // Now ready
diff --git a/aegisub/src/audio_player_oss.h b/aegisub/src/audio_player_oss.h
index 8217232cb..6d54de3ee 100644
--- a/aegisub/src/audio_player_oss.h
+++ b/aegisub/src/audio_player_oss.h
@@ -49,12 +49,8 @@
 #endif
 
 #include "include/aegisub/audio_player.h"
-#include "include/aegisub/audio_provider.h"
-
-#include <libaegisub/exception.h>
-
-DEFINE_SIMPLE_EXCEPTION_NOINNER(OSSError, agi::Exception, "audio/player/oss")
 
+class AudioProvider;
 class OSSPlayer;
 
 /// DOCME
diff --git a/aegisub/src/audio_player_portaudio.cpp b/aegisub/src/audio_player_portaudio.cpp
index 4ce66e736..910b55ec8 100644
--- a/aegisub/src/audio_player_portaudio.cpp
+++ b/aegisub/src/audio_player_portaudio.cpp
@@ -42,11 +42,15 @@
 #include <libaegisub/log.h>
 
 #include "audio_player_portaudio.h"
-#include "charset_conv.h"
+
+#include "audio_controller.h"
+#include "compat.h"
 #include "include/aegisub/audio_provider.h"
 #include "main.h"
 #include "utils.h"
 
+DEFINE_SIMPLE_EXCEPTION(PortAudioError, agi::AudioPlayerOpenError, "audio/player/open/portaudio")
+
 // Uncomment to enable extremely spammy debug logging
 //#define PORTAUDIO_DEBUG
 
@@ -54,7 +58,7 @@ PortAudioPlayer::PortAudioPlayer() {
 	PaError err = Pa_Initialize();
 
 	if (err != paNoError)
-		throw PortAudioError(std::string("Failed opening PortAudio:") + Pa_GetErrorText(err));
+		throw PortAudioError(std::string("Failed opening PortAudio:") + Pa_GetErrorText(err), 0);
 
 	volume = 1.0f;
 	pa_start = 0.0;
@@ -109,7 +113,7 @@ void PortAudioPlayer::OpenStream() {
 		const PaHostErrorInfo *pa_err = Pa_GetLastHostErrorInfo();
 		LOG_D_IF(pa_err->errorCode != 0, "audio/player/portaudio") << "HostError: API: " << pa_err->hostApiType << ", " << pa_err->errorText << ", " << pa_err->errorCode;
 		LOG_D("audio/player/portaudio") << "Failed initializing PortAudio stream with error: " << Pa_GetErrorText(err);
-		throw PortAudioError("Failed initializing PortAudio stream with error: " + std::string(Pa_GetErrorText(err)));
+		throw PortAudioError("Failed initializing PortAudio stream with error: " + std::string(Pa_GetErrorText(err)), 0);
 	}
 }
 
diff --git a/aegisub/src/audio_player_portaudio.h b/aegisub/src/audio_player_portaudio.h
index 7bac865ec..cd96d97c9 100644
--- a/aegisub/src/audio_player_portaudio.h
+++ b/aegisub/src/audio_player_portaudio.h
@@ -37,15 +37,15 @@
 #ifdef WITH_PORTAUDIO
 
 #include "include/aegisub/audio_player.h"
-#include "include/aegisub/audio_provider.h"
-
-#include <libaegisub/exception.h>
 
 extern "C" {
 #include <portaudio.h>
 }
 
-DEFINE_SIMPLE_EXCEPTION_NOINNER(PortAudioError, agi::Exception, "audio/player/portaudio")
+#ifndef AGI_PRE
+#include <map>
+#include <string>
+#endif
 
 /// @class PortAudioPlayer
 /// @brief PortAudio Player
diff --git a/aegisub/src/audio_player_pulse.cpp b/aegisub/src/audio_player_pulse.cpp
index 4ee58e7cd..ad8f491be 100644
--- a/aegisub/src/audio_player_pulse.cpp
+++ b/aegisub/src/audio_player_pulse.cpp
@@ -43,11 +43,11 @@
 #endif
 
 #include "audio_player_pulse.h"
+
+#include "audio_controller.h"
+#include "include/aegisub/audio_provider.h"
 #include "utils.h"
 
-
-/// @brief Constructor 
-///
 PulseAudioPlayer::PulseAudioPlayer()
 : context_notify(0, 1)
 , context_success(0, 1)
@@ -60,32 +60,20 @@ PulseAudioPlayer::PulseAudioPlayer()
 	is_playing = false;
 }
 
-
-
-/// @brief Destructor 
-///
 PulseAudioPlayer::~PulseAudioPlayer()
 {
-	if (open) CloseStream();
+	CloseStream();
 }
 
-
-
-/// @brief Open stream 
-///
 void PulseAudioPlayer::OpenStream()
 {
-	//printf("Opening PulseAudio stream\n");
 	if (open) CloseStream();
 
-	// Get provider
-	AudioProvider *provider = GetProvider();
-
 	// Initialise a mainloop
 	//printf("Initialising threaded main loop\n");
 	mainloop = pa_threaded_mainloop_new();
 	if (!mainloop) {
-		throw "Failed to initialise PulseAudio threaded mainloop object";
+		throw agi::AudioPlayerOpenError("Failed to initialise PulseAudio threaded mainloop object", 0);
 	}
 	//printf("Starting main loop\n");
 	pa_threaded_mainloop_start(mainloop);
@@ -95,7 +83,7 @@ void PulseAudioPlayer::OpenStream()
 	context = pa_context_new(pa_threaded_mainloop_get_api(mainloop), "Aegisub");
 	if (!context) {
 		pa_threaded_mainloop_free(mainloop);
-		throw "Failed to create PulseAudio context";
+		throw agi::AudioPlayerOpenError("Failed to create PulseAudio context", 0);
 	}
 	pa_context_set_state_callback(context, (pa_context_notify_cb_t)pa_context_notify, this);
 
@@ -113,9 +101,7 @@ void PulseAudioPlayer::OpenStream()
 			pa_context_unref(context);
 			pa_threaded_mainloop_stop(mainloop);
 			pa_threaded_mainloop_free(mainloop);
-			wxString s(pa_strerror(paerror), wxConvUTF8);
-			s.Prepend("PulseAudio reported error: ");
-			throw s.c_str();
+			throw agi::AudioPlayerOpenError(std::string("PulseAudio reported error: ") + pa_strerror(paerror), 0);
 		}
 		// otherwise loop once more
 	}
@@ -137,7 +123,7 @@ void PulseAudioPlayer::OpenStream()
 		pa_context_unref(context);
 		pa_threaded_mainloop_stop(mainloop);
 		pa_threaded_mainloop_free(mainloop);
-		throw "PulseAudio could not create stream";
+		throw agi::AudioPlayerOpenError("PulseAudio could not create stream", 0);
 	}
 	pa_stream_set_state_callback(stream, (pa_stream_notify_cb_t)pa_stream_notify, this);
 	pa_stream_set_write_callback(stream, (pa_stream_request_cb_t)pa_stream_write, this);
@@ -147,9 +133,7 @@ void PulseAudioPlayer::OpenStream()
 	paerror = pa_stream_connect_playback(stream, NULL, NULL, (pa_stream_flags_t)(PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_NOT_MONOTONOUS|PA_STREAM_AUTO_TIMING_UPDATE), NULL, NULL);
 	if (paerror) {
 		printf("PulseAudio reported error: %s (%d)\n", pa_strerror(paerror), paerror);
-		wxString s(pa_strerror(paerror), wxConvUTF8);
-		s.Prepend("PulseAudio reported error: ");
-		throw s.c_str();
+		throw agi::AudioPlayerOpenError(std::string("PulseAudio reported error: ") + pa_strerror(paerror), 0);
 	}
 	while (true) {
 		stream_notify.Wait();
@@ -158,7 +142,7 @@ void PulseAudioPlayer::OpenStream()
 		} else if (sstate == PA_STREAM_FAILED) {
 			paerror = pa_context_errno(context);
 			printf("PulseAudio player: Stream connection failed: %s (%d)\n", pa_strerror(paerror), paerror);
-			throw "PulseAudio player: Something went wrong connecting the stream";
+			throw agi::AudioPlayerOpenError("PulseAudio player: Something went wrong connecting the stream", 0);
 		}
 	}
 	//printf("Connected playback stream, now playing\n\n");
@@ -168,11 +152,6 @@ void PulseAudioPlayer::OpenStream()
 	open = true;
 }
 
-
-
-/// @brief Close stream 
-/// @return 
-///
 void PulseAudioPlayer::CloseStream()
 {
 	if (!open) return;
@@ -192,12 +171,6 @@ void PulseAudioPlayer::CloseStream()
 	open = false;
 }
 
-
-
-/// @brief Play 
-/// @param start 
-/// @param count 
-///
 void PulseAudioPlayer::Play(int64_t start,int64_t count)
 {
 	//printf("Starting PulseAudio playback\n");
@@ -249,12 +222,6 @@ void PulseAudioPlayer::Play(int64_t start,int64_t count)
 	if (displayTimer && !displayTimer->IsRunning()) displayTimer->Start(15);
 }
 
-
-
-/// @brief Stop 
-/// @param timerToo 
-/// @return 
-///
 void PulseAudioPlayer::Stop(bool timerToo)
 {
 	if (!is_playing) return;
@@ -286,61 +253,31 @@ void PulseAudioPlayer::Stop(bool timerToo)
         }
 }
 
-
-
-/// @brief DOCME
-/// @return 
-///
 bool PulseAudioPlayer::IsPlaying()
 {
 	return is_playing;
 }
 
-
-
-/// @brief Set end 
-/// @param pos 
-///
 void PulseAudioPlayer::SetEndPosition(int64_t pos)
 {
 	end_frame = pos;
 }
 
-
-
-/// @brief Set current position 
-/// @param pos 
-///
 void PulseAudioPlayer::SetCurrentPosition(int64_t pos)
 {
 	cur_frame = pos;
 }
 
-
-
-/// @brief DOCME
-/// @return 
-///
 int64_t PulseAudioPlayer::GetStartPosition()
 {
 	return start_frame;
 }
 
-
-
-/// @brief DOCME
-/// @return 
-///
 int64_t PulseAudioPlayer::GetEndPosition()
 {
 	return end_frame;
 }
 
-
-
-/// @brief Get current position 
-/// @return 
-///
 int64_t PulseAudioPlayer::GetCurrentPosition()
 {
 	if (!is_playing) return 0;
@@ -356,52 +293,28 @@ int64_t PulseAudioPlayer::GetCurrentPosition()
 	return start_frame + playtime * provider->GetSampleRate() / (1000*1000);
 }
 
-
-
 /// @brief Called by PA to notify about contetxt operation completion
-/// @param c       
-/// @param success 
-/// @param thread  
-///
 void PulseAudioPlayer::pa_context_success(pa_context *c, int success, PulseAudioPlayer *thread)
 {
 	thread->context_success_val = success;
 	thread->context_success.Post();
 }
 
-
-
 /// @brief Called by PA to notify about other context-related stuff
-/// @param c      
-/// @param thread 
-///
 void PulseAudioPlayer::pa_context_notify(pa_context *c, PulseAudioPlayer *thread)
 {
 	thread->cstate = pa_context_get_state(thread->context);
 	thread->context_notify.Post();
 }
 
-
-
 /// @brief Called by PA when an operation completes
-/// @param p       
-/// @param success 
-/// @param thread  
-///
 void PulseAudioPlayer::pa_stream_success(pa_stream *p, int success, PulseAudioPlayer *thread)
 {
 	thread->stream_success_val = success;
 	thread->stream_success.Post();
 }
 
-
-
 /// @brief Called by PA to request more data (and other things?)
-/// @param p      
-/// @param length 
-/// @param thread 
-/// @return 
-///
 void PulseAudioPlayer::pa_stream_write(pa_stream *p, size_t length, PulseAudioPlayer *thread)
 {
 	if (!thread->is_playing) return;
@@ -434,12 +347,7 @@ void PulseAudioPlayer::pa_stream_write(pa_stream *p, size_t length, PulseAudioPl
 	thread->cur_frame += frames;
 }
 
-
-
 /// @brief Called by PA to notify about other stuff
-/// @param p      
-/// @param thread 
-///
 void PulseAudioPlayer::pa_stream_notify(pa_stream *p, PulseAudioPlayer *thread)
 {
 	thread->sstate = pa_stream_get_state(thread->stream);
diff --git a/aegisub/src/audio_player_pulse.h b/aegisub/src/audio_player_pulse.h
index 2d26df865..440e99ad1 100644
--- a/aegisub/src/audio_player_pulse.h
+++ b/aegisub/src/audio_player_pulse.h
@@ -38,7 +38,6 @@
 #include <pulse/pulseaudio.h>
 
 #include "include/aegisub/audio_player.h"
-#include "include/aegisub/audio_provider.h"
 
 class PulseAudioPlayer;
 
@@ -141,16 +140,7 @@ public:
 	void SetEndPosition(int64_t pos);
 	void SetCurrentPosition(int64_t pos);
 
-
-	/// @brief DOCME
-	/// @param vol 
-	/// @return 
-	///
 	void SetVolume(double vol) { volume = vol; }
-
-	/// @brief DOCME
-	/// @return 
-	///
 	double GetVolume() { return volume; }
 };
 
diff --git a/aegisub/src/audio_provider.cpp b/aegisub/src/audio_provider.cpp
index 0d8ce5518..4905b7ba1 100644
--- a/aegisub/src/audio_provider.cpp
+++ b/aegisub/src/audio_provider.cpp
@@ -41,6 +41,7 @@
 #include <wx/thread.h>
 #endif
 
+#include "audio_controller.h"
 #ifdef WITH_AVISYNTH
 #include "audio_provider_avs.h"
 #endif
@@ -56,13 +57,6 @@
 #include "frame_main.h"
 #include "main.h"
 
-/// @brief Get audio with volume 
-/// @param buf    
-/// @param start  
-/// @param count  
-/// @param volume 
-/// @return 
-///
 void AudioProvider::GetAudioWithVolume(void *buf, int64_t start, int64_t count, double volume) const {
 	try {
 		GetAudio(buf,start,count);
@@ -92,8 +86,9 @@ void AudioProvider::GetAudioWithVolume(void *buf, int64_t start, int64_t count,
 }
 
 AudioProvider *AudioProviderFactory::GetProvider(wxString const& filename, int cache) {
-	AudioProvider *provider = NULL;
-	bool found = false;
+	AudioProvider *provider = 0;
+	bool found_file = false;
+	bool found_audio = false;
 	std::string msg;
 
 	if (!OPT_GET("Provider/Audio/PCM/Disable")->GetBool()) {
@@ -104,16 +99,16 @@ AudioProvider *AudioProviderFactory::GetProvider(wxString const& filename, int c
 		catch (agi::FileNotFoundError const& err) {
 			msg = "PCM audio provider: " + err.GetMessage() + " not found.\n";
 		}
-		catch (AudioOpenError const& err) {
-			found = true;
-			msg += err.GetMessage() + "\n";
+		catch (agi::AudioOpenError const& err) {
+			found_file = true;
+			msg += err.GetChainedMessage() + "\n";
 		}
 	}
 	if (!provider) {
 		std::vector<std::string> list = GetClasses(OPT_GET("Audio/Provider")->GetString());
-		if (list.empty()) throw AudioOpenError("No audio providers are available.");
+		if (list.empty()) throw agi::NoAudioProvidersError("No audio providers are available.", 0);
 
-		for (unsigned int i=0;i<list.size();i++) {
+		for (size_t i = 0; i < list.size() ; ++i) {
 			try {
 				provider = Create(list[i], filename);
 				if (provider) break;
@@ -121,20 +116,25 @@ AudioProvider *AudioProviderFactory::GetProvider(wxString const& filename, int c
 			catch (agi::FileNotFoundError const& err) {
 				msg += list[i] + ": " + err.GetMessage() + " not found.\n";
 			}
-			catch (AudioOpenError const& err) {
-				found = true;
-				msg += list[i] + ": " + err.GetMessage() + "\n";
+			catch (agi::AudioDataNotFoundError const& err) {
+				found_file = true;
+				msg += list[i] + ": " + err.GetChainedMessage() + "\n";
+			}
+			catch (agi::AudioOpenError const& err) {
+				found_audio = true;
+				found_file = true;
+				msg += list[i] + ": " + err.GetChainedMessage() + "\n";
 			}
 		}
 	}
 	if (!provider) {
-		if (found) {
-			throw AudioOpenError(msg);
-		}
-		else {
-			throw agi::FileNotFoundError(STD_STR(filename));
-		}
+		if (found_audio)
+			throw agi::AudioProviderOpenError(msg, 0);
+		if (found_file)
+			throw agi::AudioDataNotFoundError(msg, 0);
+		throw agi::FileNotFoundError(STD_STR(filename));
 	}
+
 	bool needsCache = provider->NeedsCache();
 
 	// Give it a converter if needed
@@ -155,7 +155,7 @@ AudioProvider *AudioProviderFactory::GetProvider(wxString const& filename, int c
 	// Convert to HD
 	if (cache == 2) return new HDAudioProvider(provider, &progress);
 
-	throw AudioOpenError("Unknown caching method");
+	throw agi::AudioCacheOpenError("Unknown caching method", 0);
 }
 
 /// @brief Register all providers 
diff --git a/aegisub/src/audio_provider_avs.cpp b/aegisub/src/audio_provider_avs.cpp
index fd12b5f7d..cbe206cc4 100644
--- a/aegisub/src/audio_provider_avs.cpp
+++ b/aegisub/src/audio_provider_avs.cpp
@@ -46,6 +46,8 @@
 #endif
 
 #include "audio_provider_avs.h"
+
+#include "audio_controller.h"
 #include "charset_conv.h"
 #include "compat.h"
 #include "main.h"
@@ -55,56 +57,64 @@
 /// @brief Constructor 
 /// @param _filename 
 ///
-AvisynthAudioProvider::AvisynthAudioProvider(wxString filename) try : filename(filename) {
-	AVSValue script;
-	wxMutexLocker lock(AviSynthMutex);
+AvisynthAudioProvider::AvisynthAudioProvider(wxString filename)
+: filename(filename)
+{
+	try {
+		AVSValue script;
+		wxMutexLocker lock(AviSynthMutex);
 
-	wxFileName fn(filename);
-	if (!fn.FileExists())
-		throw agi::FileNotFoundError(STD_STR(filename));
+		wxFileName fn(filename);
+		if (!fn.FileExists())
+			throw agi::FileNotFoundError(STD_STR(filename));
 
-	// Include
-	if (filename.EndsWith(".avs")) {
-		char *fname = env->SaveString(fn.GetShortPath().mb_str(csConvLocal));
-		script = env->Invoke("Import", fname);
-	}
-
-	// Use DirectShowSource
-	else {
-		const char * argnames[3] = { 0, "video", "audio" };
-		AVSValue args[3] = { env->SaveString(fn.GetShortPath().mb_str(csConvLocal)), false, true };
-
-		// Load DirectShowSource.dll from app dir if it exists
-		wxFileName dsspath(StandardPaths::DecodePath("?data/DirectShowSource.dll"));
-		if (dsspath.FileExists()) {
-			env->Invoke("LoadPlugin",env->SaveString(dsspath.GetShortPath().mb_str(csConvLocal)));
+		// Include
+		if (filename.EndsWith(".avs")) {
+			char *fname = env->SaveString(fn.GetShortPath().mb_str(csConvLocal));
+			script = env->Invoke("Import", fname);
 		}
 
-		// Load audio with DSS if it exists
-		if (env->FunctionExists("DirectShowSource")) {
-			script = env->Invoke("DirectShowSource", AVSValue(args,3),argnames);
-		}
-		// Otherwise fail
+		// Use DirectShowSource
 		else {
-			throw AudioOpenError("No suitable audio source filter found. Try placing DirectShowSource.dll in the Aegisub application directory.");
-		}
-	}
+			const char * argnames[3] = { 0, "video", "audio" };
+			AVSValue args[3] = { env->SaveString(fn.GetShortPath().mb_str(csConvLocal)), false, true };
 
-	LoadFromClip(script);
-}
-catch (AvisynthError &err) {
-	throw AudioOpenError("Avisynth error: " + std::string(err.msg));
+			// Load DirectShowSource.dll from app dir if it exists
+			wxFileName dsspath(StandardPaths::DecodePath("?data/DirectShowSource.dll"));
+			if (dsspath.FileExists()) {
+				env->Invoke("LoadPlugin",env->SaveString(dsspath.GetShortPath().mb_str(csConvLocal)));
+			}
+
+			// Load audio with DSS if it exists
+			if (env->FunctionExists("DirectShowSource")) {
+				script = env->Invoke("DirectShowSource", AVSValue(args,3),argnames);
+			}
+			// Otherwise fail
+			else {
+				throw agi::AudioProviderOpenError("No suitable audio source filter found. Try placing DirectShowSource.dll in the Aegisub application directory.", 0);
+			}
+		}
+
+		LoadFromClip(script);
+	}
+	catch (AvisynthError &err) {
+		std::string errmsg(err.msg);
+		if (errmsg.find("filter graph manager won't talk to me") != errmsg.npos)
+			throw agi::AudioDataNotFoundError("Avisynth error: " + errmsg, 0);
+		else
+			throw agi::AudioProviderOpenError("Avisynth error: " + errmsg, 0);
+	}
 }
 
 /// @brief Read from environment 
 /// @param _clip 
 ///
-void AvisynthAudioProvider::LoadFromClip(AVSValue _clip) {	
+void AvisynthAudioProvider::LoadFromClip(AVSValue _clip) {
 	AVSValue script;
 
 	// Check if it has audio
 	VideoInfo vi = _clip.AsClip()->GetVideoInfo();
-	if (!vi.HasAudio()) throw AudioOpenError("No audio found.");
+	if (!vi.HasAudio()) throw agi::AudioDataNotFoundError("No audio found.", 0);
 
 	// Convert to one channel
 	char buffer[1024];
diff --git a/aegisub/src/audio_provider_convert.cpp b/aegisub/src/audio_provider_convert.cpp
index 010165b86..9b6a5fd58 100644
--- a/aegisub/src/audio_provider_convert.cpp
+++ b/aegisub/src/audio_provider_convert.cpp
@@ -26,6 +26,7 @@
 #include "audio_provider_convert.h"
 
 #include "aegisub_endian.h"
+#include "audio_controller.h"
 #include "include/aegisub/audio_provider.h"
 
 #include <libaegisub/scoped_ptr.h>
@@ -54,7 +55,7 @@ class BitdepthConvertAudioProvider : public AudioProviderConverter {
 public:
 	BitdepthConvertAudioProvider(AudioProvider *src) : AudioProviderConverter(src) {
 		if (bytes_per_sample > 8)
-			throw AudioOpenError("Audio format converter: audio with bitdepths greater than 64 bits/sample is currently unsupported");
+			throw agi::AudioProviderOpenError("Audio format converter: audio with bitdepths greater than 64 bits/sample is currently unsupported", 0);
 
 		src_is_native_endian = src->AreSamplesNativeEndian();
 		src_bytes_per_sample = bytes_per_sample;
diff --git a/aegisub/src/audio_provider_ffmpegsource.cpp b/aegisub/src/audio_provider_ffmpegsource.cpp
index c167ee706..90d3caa93 100644
--- a/aegisub/src/audio_provider_ffmpegsource.cpp
+++ b/aegisub/src/audio_provider_ffmpegsource.cpp
@@ -47,10 +47,11 @@
 #endif
 
 #include "audio_provider_ffmpegsource.h"
+
+#include "audio_controller.h"
 #include "compat.h"
 #include "main.h"
 
-
 /// @brief Constructor 
 /// @param filename 
 ///
@@ -64,7 +65,7 @@ FFmpegSourceAudioProvider::FFmpegSourceAudioProvider(wxString filename)
 	if (SUCCEEDED(res)) 
 		COMInited = true;
 	else if (res != RPC_E_CHANGED_MODE)
-		throw AudioOpenError("COM initialization failure");
+		throw agi::AudioProviderOpenError("COM initialization failure", 0);
 #endif
 	// initialize ffmpegsource
 	// FIXME: CPU detection?
@@ -101,7 +102,7 @@ void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
 
 	std::map<int,wxString> TrackList = GetTracksOfType(Indexer, FFMS_TYPE_AUDIO);
 	if (TrackList.size() <= 0)
-		throw AudioOpenError("no audio tracks found");
+		throw agi::AudioDataNotFoundError("no audio tracks found", 0);
 
 	// initialize the track number to an invalid value so we can detect later on
 	// whether the user actually had to choose a track or not
@@ -110,7 +111,7 @@ void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
 		TrackNumber = AskForTrackSelection(TrackList, FFMS_TYPE_AUDIO);
 		// if it's still -1 here, user pressed cancel
 		if (TrackNumber == -1)
-			throw agi::UserCancelException("audio loading cancelled by user");
+			throw agi::UserCancelException("audio loading canceled by user");
 	}
 
 	// generate a name for the cache file
@@ -137,7 +138,7 @@ void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
 		if (TrackNumber < 0) {
 			FFMS_DestroyIndex(Index);
 			Index = NULL;
-			throw AudioOpenError(std::string("Couldn't find any audio tracks: ") + ErrInfo.Buffer);
+			throw agi::AudioDataNotFoundError(std::string("Couldn't find any audio tracks: ") + ErrInfo.Buffer, 0);
 		}
 
 		// index is valid and track number is now set,
@@ -166,7 +167,7 @@ void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
 			Index = DoIndexing(Indexer, CacheName, TrackMask, GetErrorHandlingMode());
 		}
 		catch (wxString const& err) {
-			throw AudioOpenError(STD_STR(err));
+			throw agi::AudioProviderOpenError(STD_STR(err), 0);
 		}
 
 		// if tracknumber still isn't set we need to set it now
@@ -187,7 +188,7 @@ void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
 	FFMS_DestroyIndex(Index);
 	Index = NULL;
 	if (!AudioSource) {
-		throw AudioOpenError(std::string("Failed to open audio track: %s") + ErrInfo.Buffer);
+		throw agi::AudioProviderOpenError(std::string("Failed to open audio track: %s") + ErrInfo.Buffer, 0);
 	}
 		
 	const FFMS_AudioProperties AudioInfo = *FFMS_GetAudioProperties(AudioSource);
@@ -196,7 +197,7 @@ void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
 	sample_rate	= AudioInfo.SampleRate;
 	num_samples = AudioInfo.NumSamples;
 	if (channels <= 0 || sample_rate <= 0 || num_samples <= 0)
-		throw AudioOpenError("sanity check failed, consult your local psychiatrist");
+		throw agi::AudioProviderOpenError("sanity check failed, consult your local psychiatrist", 0);
 
 	// FIXME: use the actual sample format too?
 	// why not just bits_per_sample/8? maybe there's some oddball format with half bytes out there somewhere...
@@ -206,7 +207,7 @@ void FFmpegSourceAudioProvider::LoadAudio(wxString filename) {
 		case 24:	bytes_per_sample = 3; break;
 		case 32:	bytes_per_sample = 4; break;
 		default:
-			throw AudioOpenError("unknown or unsupported sample format");
+			throw agi::AudioProviderOpenError("unknown or unsupported sample format", 0);
 	}
 }
 
diff --git a/aegisub/src/audio_provider_hd.cpp b/aegisub/src/audio_provider_hd.cpp
index 13c6cfb06..cafcd0c73 100644
--- a/aegisub/src/audio_provider_hd.cpp
+++ b/aegisub/src/audio_provider_hd.cpp
@@ -46,6 +46,7 @@
 
 #include "audio_provider_hd.h"
 
+#include "audio_controller.h"
 #include "audio_provider_pcm.h"
 #include "compat.h"
 #include "main.h"
@@ -103,7 +104,7 @@ HDAudioProvider::HDAudioProvider(AudioProvider *src, agi::BackgroundRunner *br)
 	wxDiskspaceSize_t freespace;
 	if (wxGetDiskSpace(cache_dir(), 0, &freespace)) {
 		if (num_samples * channels * bytes_per_sample > freespace)
-			throw AudioOpenError("Not enough free disk space in " + STD_STR(cache_dir()) + " to cache the audio");
+			throw agi::AudioCacheOpenError("Not enough free disk space in " + STD_STR(cache_dir()) + " to cache the audio", 0);
 	}
 
 	bytes_per_sample = source->GetBytesPerSample();
diff --git a/aegisub/src/audio_provider_pcm.cpp b/aegisub/src/audio_provider_pcm.cpp
index 83a316902..fbea3475d 100644
--- a/aegisub/src/audio_provider_pcm.cpp
+++ b/aegisub/src/audio_provider_pcm.cpp
@@ -54,6 +54,7 @@
 #include <libaegisub/log.h>
 
 #include "aegisub_endian.h"
+#include "audio_controller.h"
 #include "audio_provider_pcm.h"
 #include "compat.h"
 #include "utils.h"
@@ -81,7 +82,7 @@ PCMAudioProvider::PCMAudioProvider(const wxString &filename)
 	LARGE_INTEGER li_file_size = {0};
 	if (!GetFileSizeEx(file_handle, &li_file_size)) {
 		CloseHandle(file_handle);
-		throw AudioOpenError("Failed getting file size");
+		throw agi::AudioProviderOpenError("Failed getting file size", 0);
 	}
 	file_size = li_file_size.QuadPart;
 
@@ -94,7 +95,7 @@ PCMAudioProvider::PCMAudioProvider(const wxString &filename)
 
 	if (file_mapping == 0) {
 		CloseHandle(file_handle);
-		throw AudioOpenError("Failed creating file mapping");
+		throw agi::AudioProviderOpenError("Failed creating file mapping", 0);
 	}
 
 	current_mapping = 0;
@@ -111,7 +112,7 @@ PCMAudioProvider::PCMAudioProvider(const wxString &filename)
 	memset(&filestats, 0, sizeof(filestats));
 	if (fstat(file_handle, &filestats)) {
 		close(file_handle);
-		throw AudioOpenError("Could not stat file to get size");
+		throw agi::AudioProviderOpenError("Could not stat file to get size", 0);
 	}
 	file_size = filestats.st_size;
 
@@ -331,9 +332,9 @@ public:
 
 		// Check magic values
 		if (!CheckFourcc(header.ch.type, "RIFF"))
-			throw AudioOpenError("File is not a RIFF file");
+			throw agi::AudioDataNotFoundError("File is not a RIFF file", 0);
 		if (!CheckFourcc(header.format, "WAVE"))
-			throw AudioOpenError("File is not a RIFF WAV file");
+			throw agi::AudioDataNotFoundError("File is not a RIFF WAV file", 0);
 
 		// Count how much more data we can have in the entire file
 		// The first 4 bytes are already eaten by the header.format field
@@ -356,13 +357,13 @@ public:
 			filepos += sizeof(ch);
 
 			if (CheckFourcc(ch.type, "fmt ")) {
-				if (got_fmt_header) throw AudioOpenError("Invalid file, multiple 'fmt ' chunks");
+				if (got_fmt_header) throw agi::AudioProviderOpenError("Invalid file, multiple 'fmt ' chunks", 0);
 				got_fmt_header = true;
 
 				fmtChunk &fmt = *(fmtChunk*)EnsureRangeAccessible(filepos, sizeof(fmtChunk));
 
 				if (Endian::LittleToMachine(fmt.compression) != 1)
-					throw AudioOpenError("Can't use file, not PCM encoding");
+					throw agi::AudioProviderOpenError("Can't use file, not PCM encoding", 0);
 
 				// Set stuff inherited from the AudioProvider class
 				sample_rate = Endian::LittleToMachine(fmt.samplerate);
@@ -374,7 +375,7 @@ public:
 				// This won't pick up 'data' chunks inside 'wavl' chunks
 				// since the 'wavl' chunks wrap those.
 
-				if (!got_fmt_header) throw AudioOpenError("Found 'data' chunk before 'fmt ' chunk, file is invalid.");
+				if (!got_fmt_header) throw agi::AudioProviderOpenError("Found 'data' chunk before 'fmt ' chunk, file is invalid.", 0);
 
 				int64_t samples = Endian::LittleToMachine(ch.size) / bytes_per_sample;
 				int64_t frames = samples / channels;
@@ -518,7 +519,7 @@ public:
 		int64_t smallest_possible_file = sizeof(RiffChunk) + sizeof(FormatChunk) + sizeof(DataChunk);
 
 		if (file_size < smallest_possible_file)
-			throw AudioOpenError("File is too small to be a Wave64 file");
+			throw agi::AudioDataNotFoundError("File is too small to be a Wave64 file", 0);
 
 		// Read header
 		// This should throw an exception if the mapping fails
@@ -528,9 +529,9 @@ public:
 
 		// Check magic values
 		if (!CheckGuid(header.riff_guid, w64GuidRIFF))
-			throw AudioOpenError("File is not a Wave64 RIFF file");
+			throw agi::AudioDataNotFoundError("File is not a Wave64 RIFF file", 0);
 		if (!CheckGuid(header.format_guid, w64GuidWAVE))
-			throw AudioOpenError("File is not a Wave64 WAVE file");
+			throw agi::AudioDataNotFoundError("File is not a Wave64 WAVE file", 0);
 
 		// Count how much more data we can have in the entire file
 		uint64_t data_left = Endian::LittleToMachine(header.file_size) - sizeof(RiffChunk);
@@ -550,15 +551,15 @@ public:
 
 			if (CheckGuid(chunk_guid, w64Guidfmt)) {
 				if (got_fmt_header)
-					throw AudioOpenError("Bad file, found more than one 'fmt' chunk");
+					throw agi::AudioProviderOpenError("Bad file, found more than one 'fmt' chunk", 0);
 
 				FormatChunk &fmt = *(FormatChunk*)EnsureRangeAccessible(filepos, sizeof(FormatChunk));
 				got_fmt_header = true;
 
 				if (Endian::LittleToMachine(fmt.format.wFormatTag) == 3)
-					throw AudioOpenError("File is IEEE 32 bit float format which isn't supported. Bug the developers if this matters.");
+					throw agi::AudioProviderOpenError("File is IEEE 32 bit float format which isn't supported. Bug the developers if this matters.", 0);
 				if (Endian::LittleToMachine(fmt.format.wFormatTag) != 1)
-					throw AudioOpenError("Can't use file, not PCM encoding");
+					throw agi::AudioProviderOpenError("Can't use file, not PCM encoding", 0);
 
 				// Set stuff inherited from the AudioProvider class
 				sample_rate = Endian::LittleToMachine(fmt.format.nSamplesPerSec);
@@ -567,7 +568,7 @@ public:
 			}
 			else if (CheckGuid(chunk_guid, w64Guiddata)) {
 				if (!got_fmt_header)
-					throw AudioOpenError("Found 'data' chunk before 'fmt ' chunk, file is invalid.");
+					throw agi::AudioProviderOpenError("Found 'data' chunk before 'fmt ' chunk, file is invalid.", 0);
 
 				int64_t samples = chunk_size / bytes_per_sample;
 				int64_t frames = samples / channels;
@@ -601,23 +602,35 @@ public:
 	}
 };
 
-/// @brief DOCME
-/// @param filename 
-///
 AudioProvider *CreatePCMAudioProvider(const wxString &filename)
 {
+	bool wrong_file_type = true;
 	std::string msg;
+
 	try {
 		return new RiffWavPCMAudioProvider(filename);
 	}
-	catch (AudioOpenError const& err) {
+	catch (agi::AudioDataNotFoundError const& err) {
 		msg = "RIFF PCM WAV audio provider: " + err.GetMessage();
 	}
+	catch (agi::AudioProviderOpenError const& err) {
+		wrong_file_type = false;
+		msg = "RIFF PCM WAV audio provider: " + err.GetMessage();
+	}
+
 	try {
 		return new Wave64AudioProvider(filename);
 	}
-	catch (AudioOpenError const& err) {
+	catch (agi::AudioDataNotFoundError const& err) {
 		msg += "\nWave64 audio provider: " + err.GetMessage();
-		throw AudioOpenError(msg);
 	}
+	catch (agi::AudioProviderOpenError const& err) {
+		wrong_file_type = false;
+		msg += "\nWave64 audio provider: " + err.GetMessage();
+	}
+
+	if (wrong_file_type)
+		throw agi::AudioDataNotFoundError(msg, 0);
+	else
+		throw agi::AudioProviderOpenError(msg, 0);
 }
diff --git a/aegisub/src/audio_provider_ram.cpp b/aegisub/src/audio_provider_ram.cpp
index ec04e708b..646fa42e5 100644
--- a/aegisub/src/audio_provider_ram.cpp
+++ b/aegisub/src/audio_provider_ram.cpp
@@ -40,6 +40,7 @@
 
 #include "audio_provider_ram.h"
 
+#include "audio_controller.h"
 #include "compat.h"
 #include "main.h"
 #include "utils.h"
@@ -67,7 +68,7 @@ RAMAudioProvider::RAMAudioProvider(AudioProvider *src, agi::BackgroundRunner *br
 	}
 	catch (std::bad_alloc const&) {
 		Clear();
-		throw AudioOpenError("Couldn't open audio, not enough ram available.");
+		throw agi::AudioCacheOpenError("Couldn't open audio, not enough ram available.", 0);
 	}
 
 	// Copy parameters
diff --git a/aegisub/src/auto4_base.h b/aegisub/src/auto4_base.h
index 21edd672a..cac2ea094 100644
--- a/aegisub/src/auto4_base.h
+++ b/aegisub/src/auto4_base.h
@@ -72,8 +72,6 @@ namespace agi { struct Context; }
 namespace cmd { class Command; }
 
 
-DECLARE_EVENT_TYPE(wxEVT_AUTOMATION_SCRIPT_COMPLETED, -1)
-
 /// DOCME
 namespace Automation4 {
 	DEFINE_BASE_EXCEPTION_NOINNER(AutomationError, agi::Exception)
diff --git a/aegisub/src/command/audio.cpp b/aegisub/src/command/audio.cpp
index 2fd353de6..975ceacf8 100644
--- a/aegisub/src/command/audio.cpp
+++ b/aegisub/src/command/audio.cpp
@@ -119,7 +119,12 @@ struct audio_open_blank : public Command {
 	STR_HELP("Open a 150 minutes blank audio clip, for debugging.")
 
 	void operator()(agi::Context *c) {
-		c->audioController->OpenAudio("dummy-audio:silence?sr=44100&bd=16&ch=1&ln=396900000");
+		try {
+			c->audioController->OpenAudio("dummy-audio:silence?sr=44100&bd=16&ch=1&ln=396900000");
+		}
+		catch (agi::Exception const& e) {
+			wxMessageBox(lagi_wxString(e.GetChainedMessage()), "Error loading file", wxICON_ERROR | wxOK);
+		}
 	}
 };
 
@@ -132,7 +137,12 @@ struct audio_open_noise : public Command {
 	STR_HELP("Open a 150 minutes noise-filled audio clip, for debugging.")
 
 	void operator()(agi::Context *c) {
-		c->audioController->OpenAudio("dummy-audio:noise?sr=44100&bd=16&ch=1&ln=396900000");
+		try {
+			c->audioController->OpenAudio("dummy-audio:noise?sr=44100&bd=16&ch=1&ln=396900000");
+		}
+		catch (agi::Exception const& e) {
+			wxMessageBox(lagi_wxString(e.GetChainedMessage()), "Error loading file", wxICON_ERROR | wxOK);
+		}
 	}
 };
 
@@ -153,6 +163,7 @@ struct audio_open_video : public Command {
 		try {
 			c->audioController->OpenAudio(c->videoController->GetVideoName());
 		}
+		catch (agi::UserCancelException const&) { }
 		catch (agi::Exception const& e) {
 			wxMessageBox(lagi_wxString(e.GetChainedMessage()), "Error loading file", wxICON_ERROR | wxOK);
 		}
diff --git a/aegisub/src/include/aegisub/audio_player.h b/aegisub/src/include/aegisub/audio_player.h
index 69e98525f..eb785cb4e 100644
--- a/aegisub/src/include/aegisub/audio_player.h
+++ b/aegisub/src/include/aegisub/audio_player.h
@@ -50,9 +50,7 @@ class AudioProvider;
 /// @brief DOCME
 ///
 /// DOCME
-class AudioPlayer : public wxEvtHandler {
-	void OnStopAudio(wxCommandEvent &event);
-
+class AudioPlayer {
 protected:
 	/// DOCME
 	AudioProvider *provider;
@@ -64,18 +62,11 @@ public:
 	AudioPlayer();
 	virtual ~AudioPlayer();
 
-
-	/// @brief DOCME
-	///
 	virtual void OpenStream() {}
-
-	/// @brief DOCME
-	///
 	virtual void CloseStream() {}
 
 	virtual void Play(int64_t start,int64_t count)=0;	// Play sample range
 	virtual void Stop(bool timerToo=true)=0;			// Stop playing
-	virtual void RequestStop();							// Request it to stop playing in a thread-safe way
 	virtual bool IsPlaying()=0;
 
 	virtual void SetVolume(double volume)=0;
@@ -87,14 +78,8 @@ public:
 	virtual void SetEndPosition(int64_t pos)=0;
 	virtual void SetCurrentPosition(int64_t pos)=0;
 
-	virtual wxMutex *GetMutex() { return NULL; }
-
 	virtual void SetProvider(AudioProvider *new_provider) { provider = new_provider; }
 	AudioProvider *GetProvider() const { return provider; }
-
-	void SetDisplayTimer(wxTimer *timer) { displayTimer = timer; }
-
-	DECLARE_EVENT_TABLE()
 };
 
 class AudioPlayerFactory : public Factory0<AudioPlayer> {
@@ -104,5 +89,3 @@ public:
 	static void RegisterProviders();
 	static AudioPlayer *GetAudioPlayer();
 };
-
-DECLARE_EVENT_TYPE(wxEVT_STOP_AUDIO, -1)
diff --git a/aegisub/src/include/aegisub/audio_provider.h b/aegisub/src/include/aegisub/audio_provider.h
index 6eb6900b2..5baa22f1c 100644
--- a/aegisub/src/include/aegisub/audio_provider.h
+++ b/aegisub/src/include/aegisub/audio_provider.h
@@ -98,7 +98,5 @@ public:
 };
 
 DEFINE_BASE_EXCEPTION_NOINNER(AudioProviderError, agi::Exception)
-DEFINE_SIMPLE_EXCEPTION_NOINNER(AudioOpenError, AudioProviderError, "audio/open/failed")
-
 /// Error of some sort occurred while decoding a frame
 DEFINE_SIMPLE_EXCEPTION_NOINNER(AudioDecodeError, AudioProviderError, "audio/error")