diff --git a/Source/HBIOS/sound.asm b/Source/HBIOS/sound.asm
index 3744f130..b793d32c 100644
--- a/Source/HBIOS/sound.asm
+++ b/Source/HBIOS/sound.asm
@@ -7,6 +7,7 @@
 
 PSG_RSEL	.EQU	$9A
 PSG_RDAT	.EQU	$9B
+PSG_ACR		.EQU	$9C
 AYR0CHAP	.EQU	$00
 AYR1CHAP	.EQU	$01
 AYR2CHBP	.EQU	$02
@@ -22,24 +23,24 @@ AYR9BVOL	.EQU	$09
 SND_INIT:
 	CALL	NEWLINE			; FORMATTING
 	PRTS("PSG: IO=0x$")
-	LD	A,PSG_RSEL
+	LD		A,PSG_RSEL
 	CALL	PRTHEXBYTE
 	CALL	PSG_PROBE		; CHECK FOR HW EXISTENCE
-	JR	Z,PSG_INIT1			; CONTINUE IF PRESENT
+	JR		Z,PSG_INIT1			; CONTINUE IF PRESENT
 ;
 ;	HARDWARE NOT PRESENT
 ;
 	PRTS(" NOT PRESENT$")
-	OR	$FF					; SIGNAL FAILURE
+	OR		$FF					; SIGNAL FAILURE
 	RET
 ;	
 PSG_INIT1:
 	CALL	PSG_INIT2
 	CALL	BEEP
 PSG_INIT2:
-	LD A,AYR7ENAB		; SET MIXER CONTROL / IO ENABLE
-	LD E,$FF			; $FF - 11 111 111
-	CALL WRTPSG			; I/O PORTS DISABLED, NOISE CHANNEL C, B, A DISABLE, TONE CHANNEL C, B, A DISABLE
+	LD		A,AYR7ENAB		; SET MIXER CONTROL / IO ENABLE
+	LD		E,$FF			; $FF - 11 111 111
+	CALL	WRTPSG			; I/O PORTS DISABLED, NOISE CHANNEL C, B, A DISABLE, TONE CHANNEL C, B, A DISABLE
 ;  
 	LD B,2
 	LD A,AYR8AVOL		; SET VOLUME TO 0
@@ -87,7 +88,7 @@ WRTPSG:
 ;
 PSG_PROBE:
 	LD	A,$FF
-	OUT	(TMS_ACR),A		; INIT AUX CONTROL REG
+	OUT	(PSG_ACR),A		; INIT AUX CONTROL REG
 	XOR A
 	RET
 ;