diff -urN midi_prog-/Makefile midi_prog/Makefile
--- midi_prog-/Makefile	Fri Mar 27 00:00:00 2015
+++ midi_prog/Makefile	Fri Mar 27 02:00:00 2015
@@ -1,6 +1,6 @@
 CC = gcc
 LIB = -lm -lpthread -L../cui -lcui
-TARG = prog44
+TARG = prog45
 OBJS = main.o vcf.o ch.o delay.o stat.o note.o env.o tone.o filter.o lfo.o modu.o vco.o wave.o out.o rd.o util.o
 OBJS += cui_tone.o
 CFLAGS += -Wall -I..
diff -urN midi_prog-/main.c midi_prog/main.c
--- midi_prog-/main.c	Thu Mar 26 00:00:00 2015
+++ midi_prog/main.c	Fri Mar 27 02:00:00 2015
@@ -112,7 +112,7 @@
 		case 9:
 			note = rd();
 			velo = rd();
-			note_onoff(hi == 9, sec, ch, note, velo);
+			if(ch_inf[ch].adj_vol > 0) note_onoff(hi == 9, sec, ch, note, velo);
 			break;
 		case 0xb: /* control change */
 			type = rd();