diff -urN midi_prog-/rawmix2.c midi_prog/rawmix2.c
--- midi_prog-/rawmix2.c	Sat Aug 29 00:00:00 2015
+++ midi_prog/rawmix2.c	Tue Sep  1 00:00:00 2015
@@ -55,6 +55,7 @@
 	for(i=0; i<MIX_N; i++){
 		struct mix *m = &mx[i];
 		mix_init(m, i, ac, av);
+		if(!m->en) continue;
 		if(m->in.fp == NULL){
 			fprintf(stderr, "i=%d fn=%s\n", i, m->in.fn);
 			ERR("Can't open");
diff -urN midi_prog-/tool.c midi_prog/tool.c
--- midi_prog-/tool.c	Fri Aug 28 00:00:00 2015
+++ midi_prog/tool.c	Tue Sep  1 00:00:00 2015
@@ -80,16 +80,53 @@
 	struct pitdet *pd;
 	int note;
 	double on_sec;
+	int pre_release;
+	int cut_over_tone;
 } note_onoff[ NOTE_N ];
 
 void
-note_onoff_init(struct note_onoff *nto, struct pitdet *pd, int note, int lmt_sec)
+note_onoff_init(struct note_onoff *nto, struct pitdet *pd, int note, int ac, char **av)
 {
+	double lmt_sec = opt_double("-lmt_sec", ac, av, 2.0/32);
 	chatt_init(&nto->ct, lmt_sec);
 	abuf_init(&nto->ab, pd->tick_freq, 2*4*4);
 	nto->pd = pd;
 	nto->note = note;
 	nto->on_sec = -1;
+	nto->pre_release = opt_double("-pre_release", ac, av, 0);
+	nto->cut_over_tone = opt_idx("-cut_over_tone", ac, av) > 0;
+}
+
+int
+note_onoff_velo(struct note_onoff *nto, double on_sec, double off_sec)
+{
+	double v = abuf_mean(&nto->ab, on_sec, off_sec);
+	int velo = (int)(128 * v / nto->pd->max_v);
+	if(velo < 0) velo = 0;
+	if(velo > 127) velo = 127;
+	return velo;
+}
+
+int
+note_onoff_is_overtone(struct note_onoff *nto, double on_sec, double off_sec, int velo)
+{
+	/* Fundamental, Overtone */
+
+	int lst[] = { 12, 12+7, 12*2, 12*2+4, 12*2+7 };
+	int lst_n = ARR_N(lst);
+	int i, t;
+
+	for(i=0; i<lst_n; i++){
+		struct note_onoff *funda;
+		int velo_f;
+
+		if((t = nto->note - lst[i]) < 0) continue;
+		funda = &note_onoff[t]; /* ! */
+		velo_f = note_onoff_velo(funda, on_sec, off_sec);
+
+		if(velo_f >= velo * 0.7) return 1;
+	}
+	return 0;
 }
 
 void
@@ -113,11 +150,14 @@
 	off_sec = nto->ct.sec;
 	nto->on_sec = -1;
 
-	v = abuf_mean(&nto->ab, on_sec, off_sec);
-	
-	velo = (int)(128 * v / nto->pd->max_v);
-	if(velo <= 0) return;
-	if(velo > 127) velo = 127;
+	if(nto->pre_release > 0){
+		int off_lmt = on_sec + nto->ct.lmt_sec;
+		off_sec -= nto->pre_release;
+		if(off_sec < off_lmt) off_sec = off_lmt;
+	}
+
+	if((velo = note_onoff_velo(nto, on_sec, off_sec)) == 0) return;
+	if(nto->cut_over_tone && note_onoff_is_overtone(nto, on_sec, off_sec, velo)) return;
 
 	tick = pitdet_sec_to_tick(nto->pd, on_sec);
 	printf("abs=%08d %s ch=%d note=%d velo=%d\n",
@@ -163,13 +203,12 @@
 	int show = opt_idx("-show", ac, av) > 0;
 	int midi = opt_idx("-midi", ac, av) > 0;
 	int abuf_wsec_chk = opt_idx("-abuf_wsec_chk", ac, av) > 0;
-	double lmt_sec = opt_double("-lmt_sec", ac, av, 2.0/32);
 	int sec, s;
 
 	in_init(&in, ac, av, NULL);
 	pitdet_init(&pd, in.smp_freq, ac, av);
 
-	for(i=0; i<NOTE_N; i++) note_onoff_init(&note_onoff[i], &pd, i, lmt_sec);
+	for(i=0; i<NOTE_N; i++) note_onoff_init(&note_onoff[i], &pd, i, ac, av);
 
 	if(opt_idx("-pitch_show", ac, av) > 0){
 		int j;