diff -urN midi_prog-/midtxt.c midi_prog/midtxt.c
--- midi_prog-/midtxt.c	Fri Aug 28 00:00:00 2015
+++ midi_prog/midtxt.c	Sun Sep 27 00:00:00 2015
@@ -505,6 +505,52 @@
 }
 
 int
+tx_note_to_str_conv(void)
+{
+	char buf[BUFSZ], *l_av[AVSZ];
+	int l_ac, i;
+
+	while(fgets(buf, sizeof(buf), stdin)){
+		l_ac = ARR_N(l_av);
+		line_to_ac_av(buf, &l_ac, l_av);
+		for(i=0; i<l_ac; i++){
+			int note;
+			if(sscanf(l_av[i], "note=%d", &note) == 1){
+				char nbuf[BUFSZ];
+				note_to_str(note, nbuf);
+				printf("note=%s", nbuf);
+			}else{
+				printf("%s", l_av[i]);
+			}
+			putchar(i < l_ac-1 ? ' ' : '\n');
+		}
+	}
+	return 0;
+}
+
+int
+tx_str_to_note_conv(void)
+{
+	char buf[BUFSZ], *l_av[AVSZ];
+	int l_ac, i;
+
+	while(fgets(buf, sizeof(buf), stdin)){
+		l_ac = ARR_N(l_av);
+		line_to_ac_av(buf, &l_ac, l_av);
+		for(i=0; i<l_ac; i++){
+			char nbuf[BUFSZ];
+			if(sscanf(l_av[i], "note=%s", nbuf) == 1){
+				printf("note=%d", str_to_note(nbuf));
+			}else{
+				printf("%s", l_av[i]);
+			}
+			putchar(i < l_ac-1 ? ' ' : '\n');
+		}
+	}
+	return 0;
+}
+
+int
 trans_conv(int ac, char **av, int trans)
 {
 	int en[ MIDI_CH_N ] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1 };
@@ -540,6 +586,8 @@
 	if(opt_idx("-tx_abs", ac, av) >= 0) return tx_abs_conv();
 	if(opt_idx("-tx_delta", ac, av) >= 0) return tx_delta_conv();
 	if(opt_idx("-len", ac, av) >= 0) return len_to_delta_conv(ac, av);
+	if(opt_idx("-note_to_str", ac, av) >= 0) return tx_note_to_str_conv();
+	if(opt_idx("-str_to_note", ac, av) >= 0) return tx_str_to_note_conv();
 	if((trans = opt_int("-tx_trans", ac, av, 0)) != 0) return trans_conv(ac, av, trans);
 
 	rd_str(4, buf);
diff -urN midi_prog-/pitdet.c midi_prog/pitdet.c
--- midi_prog-/pitdet.c	Sat Sep 26 00:00:00 2015
+++ midi_prog/pitdet.c	Sun Sep 27 00:00:00 2015
@@ -213,19 +213,17 @@
 	for(i=from_i; i<to_i; i++){
 		double sec = tbuf_sridx_to_sec(tb, i);
 		double v = a2buf_get(&t, sec);
-		rbuf_set_dbl(&tb->rb, i, v);
+		rbuf_set_dbl(&tb->rb, i, MAX(v, 0));
 	}
 
-#if 0
 	a2buf_init(&t, &low->ab, NULL, 0,0,0,1+k,0,0);
 	tb = low->tb;
 	tbuf_from_to_num(tb, ost->on_sec, ost->off_sec, &from_i, &to_i);
 	for(i=from_i; i<to_i; i++){
 		double sec = tbuf_sridx_to_sec(tb, i);
 		double v = a2buf_get(&t, sec);
-		rbuf_set_dbl(&tb->rb, i, v);
+		rbuf_set_dbl(&tb->rb, i, MAX(v, 0));
 	}
-#endif
 }
 
 static void
@@ -254,7 +252,7 @@
 pitdet_cut_overtone(struct pitdet *pd, int j)
 {
 	struct corr_info ci[] = {
-		//{ 1.0/2 }, { 1.0/3 }, { 1.0/4 },
+		{ 1.0/2 }, { 1.0/3 }, { 1.0/4 },
 		{ 2 }, { 3 }, { 4 }
 	};
 	int i, n = ARR_N(ci);
@@ -277,13 +275,13 @@
 			}
 		}
 		i = near_i;
-		if(i < 0 || near_v < 0.9) break;
+		if(i < 0 || near_v < 0.7) break;
 
 		if(ci[i].n < 1) cut_tone(&ci[i].t, &a2b, ost);
 		else cut_tone(&a2b, &ci[i].t, ost);
 
 		recalc_onoff_stat(pd, ci[i].p);
-		//recalc_onoff_stat(pd, p);
+		recalc_onoff_stat(pd, p);
 
 		if(ci[i].n < 1) break;
 	}