diff --git a/demos/second/Makefile b/demos/second/Makefile
index 8d1bc337..ddddffa0 100644
--- a/demos/second/Makefile
+++ b/demos/second/Makefile
@@ -236,6 +236,8 @@ music.inc:	generate_common MUSIC
 	./generate_common -a 0xd000 -s pt3_set_pattern music.lst >> music.inc
 	./generate_common -a 0xd000 -s copy_main_aux music.lst >> music.inc
 	./generate_common -a 0xd000 -s copy_aux_main music.lst >> music.inc
+	./generate_common -a 0xd000 -s mute_ay_both music.lst >> music.inc
+	./generate_common -a 0xd000 -s unmute_ay_both music.lst >> music.inc
 
 music2.inc:	generate_common MUSIC2
 	./generate_common -a 0xd000 -s pt3_init_song music2.lst > music2.inc
@@ -249,6 +251,8 @@ music2.inc:	generate_common MUSIC2
 	./generate_common -a 0xd000 -s current_pattern_smc music2.lst >> music2.inc
 	./generate_common -a 0xd000 -s copy_main_aux music2.lst >> music2.inc
 	./generate_common -a 0xd000 -s copy_aux_main music2.lst >> music2.inc
+	./generate_common -a 0xd000 -s mute_ay_both music2.lst >> music2.inc
+	./generate_common -a 0xd000 -s unmute_ay_both music2.lst >> music2.inc
 
 ####
 
diff --git a/demos/second/part15_transmission/spheres.s b/demos/second/part15_transmission/spheres.s
index 84b2dda4..06ef45f6 100644
--- a/demos/second/part15_transmission/spheres.s
+++ b/demos/second/part15_transmission/spheres.s
@@ -78,10 +78,12 @@ spheres_start:
 	sta	BTC_H
 
 	sei			; stop music
+	jsr	mute_ay_both
 
 	ldx	#11
 	jsr	play_audio
 
+	jsr	unmute_ay_both
 	cli
 
 
diff --git a/demos/second/pt3_lib_mockingboard_setup.s b/demos/second/pt3_lib_mockingboard_setup.s
index 5a2c1587..e05be8b7 100644
--- a/demos/second/pt3_lib_mockingboard_setup.s
+++ b/demos/second/pt3_lib_mockingboard_setup.s
@@ -162,6 +162,38 @@ clear_ay_left_loop:
 						; -1
 	rts					; 6
 
+
+
+	;=======================================
+	; mute AY -- just turn off all 3 channels
+	; should silence the card
+	;
+	;=======================================
+mute_ay_both:
+	ldx	#7				;
+	lda	#$FF				;
+	sta	MB_VALUE			;
+mute_ay_left_loop:
+	jsr	write_ay_both			;
+
+	rts					;
+
+	;=======================================
+	; unmute AY
+	;	restore to value we had before muting
+	;=======================================
+unmute_ay_both:
+	ldx	#7				;
+	lda	ENABLE				;
+	sta	MB_VALUE			;
+unmute_ay_left_loop:
+	jsr	write_ay_both			;
+
+	rts					;
+
+
+
+
 clear_ay_end:
 ;.assert >clear_ay_both = >clear_ay_end, error, "clear_ay_both crosses page"
 
diff --git a/demos/second/start.s b/demos/second/start.s
index 53cb31ac..b2a3148a 100644
--- a/demos/second/start.s
+++ b/demos/second/start.s
@@ -137,7 +137,7 @@ load_program_loop:
 	;=======================
 	;=======================
 
-	cli
+	cli			; start music
 
 	jsr	$6000
 
@@ -149,7 +149,7 @@ load_program_loop:
 	;=======================
 
 	sei				; stop music interrupts
-
+	jsr	mute_ay_both
 	jsr	clear_ay_both		; stop from making noise
 
 	; load music
@@ -202,7 +202,7 @@ load_program_loop:
 
 	jsr	pt3_init_song
 
-	cli		; start interrupts
+	cli		; start interrupts (music)
 
 	;=======================
 	;=======================
@@ -347,7 +347,7 @@ load_program_loop:
 
 	sei
 
-	jsr	clear_ay_both		; stop from making noise
+	jsr	mute_ay_both		; stop from making noise
 
 	;=============================
 	; want to load 10..12
@@ -393,6 +393,7 @@ load_program_loop2:
 
 	; restart music
 
+	jsr	unmute_ay_both		; restart
 	cli
 
 	;=======================