Instead of 1/3 screen per tick. So the distance of scroll no longer depends on the width of the audio box. Besides, 1/3 is feels to far for me when the audio box is wide.
See wangqr/Aegisub#5
Add a new Project class which is responsible for everything related to
opening and closing audio, video, subtitles, timecodes and keyframes.
This pulls almost everything not directly related to playing audio/video
out of the audio and video controllers, pulls more crap out of
FrameMain, and happens to make things a little simpler in the process.