diff --git a/src/fsk.c b/src/fsk.c
index 7667b65..01489ed 100644
--- a/src/fsk.c
+++ b/src/fsk.c
@@ -214,7 +214,7 @@ fsk_frame_analyze( fsk_plan *fskp, float *samples, float samples_per_bit,
     fsk_bits_analyze(fskp, samples+begin_databits, samples_per_bit,
 			bits_outp, databit_strengths);
 
-    // computer average bit strength 'v'
+    // compute average bit strength 'v'
     int i;
     for ( i=0; i<fskp->n_data_bits; i++ )
 	v += databit_strengths[i];
@@ -224,6 +224,10 @@ fsk_frame_analyze( fsk_plan *fskp, float *samples, float samples_per_bit,
     if ( v < FSK_MIN_STRENGTH )
 	return 0.0;
 
+#define CONFIDENCE_ALGO	2
+
+#if ( CONFIDENCE_ALGO == 1 )
+
     float confidence = 0;
     confidence += 1.0 - fabs(i_str - v);
     confidence += 1.0 - fabs(s_str - v);
@@ -232,6 +236,20 @@ fsk_frame_analyze( fsk_plan *fskp, float *samples, float samples_per_bit,
 	confidence += 1.0 - fabs(databit_strengths[i] - v);
     confidence /= (fskp->n_data_bits + 3);
 
+#elif ( CONFIDENCE_ALGO == 2 )
+
+    float confidence = 0;
+    confidence += i_str;
+    confidence += s_str;
+    confidence += p_str;
+    for ( i=0; i<fskp->n_data_bits; i++ )
+	confidence += databit_strengths[i];
+    confidence /= (fskp->n_data_bits + 3);
+
+#endif
+
+    debug_log("    frame confidence (algo #%u) = %f\n",
+	    CONFIDENCE_ALGO, confidence);
     return confidence;
 }
 
diff --git a/src/minimodem.c b/src/minimodem.c
index a56c8ac..247c458 100644
--- a/src/minimodem.c
+++ b/src/minimodem.c
@@ -525,7 +525,6 @@ main( int argc, char*argv[] )
 	if ( samples_nvalid < frame_nsamples )
 	    break;
 
-	// FIXME: explain
 	unsigned int try_max_nsamples = nsamples_per_bit;
 #define FSK_ANALYZE_NSTEPS		8	/* accuracy vs. performance */
 	unsigned int try_step_nsamples = nsamples_per_bit / FSK_ANALYZE_NSTEPS;
@@ -545,7 +544,7 @@ main( int argc, char*argv[] )
 			&frame_start_sample
 			);
 
-#define FSK_MIN_CONFIDENCE		0.5	/* not critical */
+#define FSK_MIN_CONFIDENCE		0.05
 #define FSK_MAX_NOCONFIDENCE_BITS	20
 
 	if ( confidence <= FSK_MIN_CONFIDENCE ) {
@@ -600,9 +599,9 @@ main( int argc, char*argv[] )
 	 * advance = 1 prev_stop + 1 start + N data bits == n_data_bits+2
 	 *
 	 * but actually advance just a bit less than that to allow
-	 * for clock skew, so ...
+	 * for clock skew, hence FSK_SCAN_LAG.
 	 */
-#define FSK_SCAN_LAG	0.4
+#define FSK_SCAN_LAG			0.2
 	advance = frame_start_sample +
 	    nsamples_per_bit * (float)(fskp->n_data_bits + 2 - FSK_SCAN_LAG);