diff -urN midi_prog-/Makefile midi_prog/Makefile
--- midi_prog-/Makefile	Thu Mar 26 02:00:00 2015
+++ midi_prog/Makefile	Fri Mar 27 00:00:00 2015
@@ -1,6 +1,6 @@
 CC = gcc
 LIB = -lm -lpthread -L../cui -lcui
-TARG = prog43
+TARG = prog44
 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-/cui_tone.c midi_prog/cui_tone.c
--- midi_prog-/cui_tone.c	Thu Mar 26 02:00:00 2015
+++ midi_prog/cui_tone.c	Fri Mar 27 00:00:00 2015
@@ -38,6 +38,8 @@
 	cui_num_vp_set(cui_name_child(sheet, "tune"), &tr->vco.tune);
 	cui_num_dbl_vp_set(cui_name_child(sheet, "mix"), &tr->vco.mix);
 	cui_ckbox_vp_set(cui_name_child(sheet, "ring"), &tr->vco.ring);
+	cui_ckbox_vp_set(cui_name_child(sheet, "alias_noise1"), &tr->vco.alias_noise1);
+	cui_ckbox_vp_set(cui_name_child(sheet, "alias_noise2"), &tr->vco.alias_noise2);
 
 	cui_menu_popup_vp_set(cui_name_child(sheet, "filt1"), &tr->fl1.type);
 	cui_num_dbl_vp_set(cui_name_child(sheet, "freq1"), &tr->fl1.freq);
@@ -149,9 +151,13 @@
 	cui_menu_popup_new(bs_vco, 0, 0, -1, wave_lst, 0);
 	cui_wlb_name_new(bs_vco, "wave1 ", "wave1", NULL);
 
-	cui_menu_popup_new(bs_vco, CUI_CHILD_X2+3, CUI_CHILD_Y, -1, wave_lst, 0);
+	cui_ckbox_new(bs_vco, CUI_CHILD_X, CUI_CHILD_Y2, "alias_noise1", FALSE)->name = "alias_noise1";
+
+	cui_menu_popup_new(bs_vco, CUI_CHILD_X2+3, 0, -1, wave_lst, 0);
 	cui_wlb_name_new(bs_vco, "wave2 ", "wave2", NULL);
 	
+	cui_ckbox_new(bs_vco, CUI_CHILD_X, CUI_CHILD_Y2, "alias_noise2", FALSE)->name = "alias_noise2";
+
 	cui_num_new(bs_vco, CUI_CHILD_X, CUI_CHILD_Y2, 6+3, 0, -24000, 24000, 0);
 	cui_wlb_name_new(bs_vco, "tune ", "tune", " cent");
 
diff -urN midi_prog-/tone.c midi_prog/tone.c
--- midi_prog-/tone.c	Wed Mar 25 01:00:03 2015
+++ midi_prog/tone.c	Fri Mar 27 00:00:00 2015
@@ -73,7 +73,7 @@
 		{ OFF, }, OFF,
 	},{
 		"hi-hat close",
-		{ WAVE_SQUARE, WAVE_SQUARE, 700, 0.9, ON },
+		{ WAVE_SQUARE, WAVE_SQUARE, 700, 0.9, ON, ON, ON },
 		{ LPF, 16000, 2 }, { OFF, },
 		{ 0, 0.15, 0, 0.15 },
 		0.6,
@@ -82,7 +82,7 @@
 		{ OFF, }, OFF,
 	},{
 		"hi-hat open",
-		{ WAVE_SQUARE, WAVE_SQUARE, 700, 0.9, ON },
+		{ WAVE_SQUARE, WAVE_SQUARE, 700, 0.9, ON, ON, ON },
 		{ LPF, 16000, 2 }, { OFF, },
 		{ 0, 0, 1, 0.35 },
 		0.6,
@@ -326,10 +326,10 @@
 	modu_out(env_v, &tn->env_modu, modu_v);
 
 	vco = &tn->vco;
-	v1 = vco_out(vco->wave1, &stat->vco[0], freq, ot->sec, modu_v[0]);
+	v1 = vco_out(vco->wave1, vco->alias_noise1, &stat->vco[0], freq, ot->sec, modu_v[0]);
 
 	modu_v[1] += vco->tune * (1.0 / 1200);
-	v2 = vco_out(vco->wave2, &stat->vco[1], freq, ot->sec, modu_v[1]);
+	v2 = vco_out(vco->wave2, vco->alias_noise2, &stat->vco[1], freq, ot->sec, modu_v[1]);
 	if(vco->ring){
 		v = v1 * v2;
 		v1 = (v1 + v2) * 0.5;
diff -urN midi_prog-/vco.c midi_prog/vco.c
--- midi_prog-/vco.c	Sun Jan 26 00:00:00 2014
+++ midi_prog/vco.c	Fri Mar 27 00:00:00 2015
@@ -9,14 +9,14 @@
 }
 
 double
-vco_out(int wave, struct vco_stat_rec *stat, double freq, double sec, double modu_v)
+vco_out(int wave, int alias_noise, struct vco_stat_rec *stat, double freq, double sec, double modu_v)
 {
 	double cycle_prev;
 
 	if(modu_v != 0) freq *= pow(2, modu_v);
 	cycle_prev = stat->cycle;
 	vco_stat_update(stat, freq, sec);
-	return wave_out2(wave, cycle_prev, stat->cycle);
+	return wave_out2(wave, alias_noise, cycle_prev, stat->cycle);
 }
 
 /* EOF */
diff -urN midi_prog-/vco.h midi_prog/vco.h
--- midi_prog-/vco.h	Fri Jan 24 00:00:00 2014
+++ midi_prog/vco.h	Fri Mar 27 00:00:00 2015
@@ -12,9 +12,10 @@
 	int tune; /* for vco2 */
 	double mix;
 	int ring;
+	int alias_noise1, alias_noise2;
 };
 
 void vco_stat_update(struct vco_stat_rec *stat, double freq, double sec);
-double vco_out(int wave, struct vco_stat_rec *stat, double freq, double sec, double modu_v);
+double vco_out(int wave, int alias_noise, struct vco_stat_rec *stat, double freq, double sec, double modu_v);
 
 #endif
diff -urN midi_prog-/wave.c midi_prog/wave.c
--- midi_prog-/wave.c	Sun Jan 26 00:00:00 2014
+++ midi_prog/wave.c	Fri Mar 27 00:00:00 2015
@@ -26,7 +26,7 @@
 }
 
 double
-wave_out2(int wave, double cycle_prev, double cycle)
+wave_out2(int wave, int alias_noise, double cycle_prev, double cycle)
 {
 	double d, v, v_prev;
 
@@ -35,6 +35,7 @@
 	case WAVE_NOISE:
 		return wave_out(wave, cycle);
 	}
+	if(alias_noise) return wave_out(wave, cycle);
 	cycle -= (int)cycle;
 	cycle_prev -= (int)cycle_prev;
 	d = cycle - cycle_prev;
diff -urN midi_prog-/wave.h midi_prog/wave.h
--- midi_prog-/wave.h	Sun Jan 26 00:00:00 2014
+++ midi_prog/wave.h	Fri Mar 27 00:00:00 2015
@@ -10,6 +10,6 @@
 #define WAVE_INTEGRAL	(1<<8)
 
 double wave_out(int wave, double cycle);
-double wave_out2(int wave, double cycle_prev, double cycle);
+double wave_out2(int wave, int alias_noise, double cycle_prev, double cycle);
 
 #endif