diff --git a/Source/HBIOS/audio.inc b/Source/HBIOS/audio.inc
index e1a9fbe4..2b69513b 100644
--- a/Source/HBIOS/audio.inc
+++ b/Source/HBIOS/audio.inc
@@ -11,6 +11,8 @@
 
 #DEFINE AUDDEBUG(S) CALL PRTSTRD \ .TEXT S \ .TEXT "$"	; $$$$$$ PRINT STRING S TO CONSOLE - PRTD("HELLO") - NO TRAILING $ REQUIRED
 
+#DEFINE AUDTRACE_CR AUDDEBUG("\r\n$")
+
 #ELSE
 #DEFINE	AUDTRACE(S)
 #DEFINE AUDTRACE_A
@@ -23,4 +25,6 @@
 #DEFINE AUDTRACE_IY
 
 #DEFINE AUDDEBUG(STR)
+
+#DEFINE AUDTRACE_CR
 #ENDIF
diff --git a/Source/HBIOS/ay38910.asm b/Source/HBIOS/ay38910.asm
index 8fe13b25..4b6c863f 100644
--- a/Source/HBIOS/ay38910.asm
+++ b/Source/HBIOS/ay38910.asm
@@ -58,7 +58,7 @@ AY_IDAT	.EQU	0			; NO INSTANCE DATA ASSOCIATED WITH THIS DEVICE
 ;
 ;	DEVICE CAPABILITIES AND CONFIGURATION
 ;
-SBCV2004	.EQU	1		; USE SBC-V2-004 HALF CLOCK DIVIDER	
+SBCV2004	.EQU	1		; USE SBC-V2-004 HALF CLOCK DIVIDER
 ;
 AY_TONECNT	.EQU	3		; COUNT NUMBER OF TONE CHANNELS
 AY_NOISECNT	.EQU	1		; COUNT NUMBER OF NOISE CHANNELS
@@ -106,11 +106,11 @@ AY38910_INIT:
 	LD	D,AY_R3CHBP
 	LD	E,$00
 	CALL	AY_WRTPSG		; R03 = $00 = XXXX0000
-;  
-	CALL	LDELAY			; HALF SECOND 
+;
+	CALL	LDELAY			; HALF SECOND
 ;
 	LD	E,$00			; SET VOLUME OFF
-	CALL	AY_SETV			; ON ALL CHANNELS	
+	CALL	AY_SETV			; ON ALL CHANNELS
 ;
 ;	RET
 ;
@@ -129,7 +129,7 @@ AY_INIT:
 ;======================================================================
 ;
 AY_SETV:
-	LD	B,AY_TONECNT		; NUMBER OF CHANNELS		
+	LD	B,AY_TONECNT		; NUMBER OF CHANNELS
 	LD	D,AY_R8AVOL		; BASE REGISTER FOR VOLUME
 AY_SV:	CALL	AY_WRTPSG		; CYCLING THROUGH ALL CHANNELS
 	INC	D
@@ -144,20 +144,20 @@ AY_SV:	CALL	AY_WRTPSG		; CYCLING THROUGH ALL CHANNELS
 ;======================================================================
 ;
 AY_RESET:
-	AUDTRACE(TRACE_INIT)
+	AUDTRACE(AYT_INIT)
 ;
 	CALL	AY_INIT			; SET DEFAULT CHIP CONFIGURATION
 ;
-	AUDTRACE(TRACE_VOLUME_OFF)
+	AUDTRACE(AYT_VOLOFF)
 	LD	E,0			; SET VOLUME OFF
 	CALL	AY_SETV			; ON ALL CHANNELS
 ;
 	XOR	A			; SIGNAL SUCCESS
-	LD	(PENDING_VOLUME),A	; SET VOLUME TO ZERO
+	LD	(AY_PENDING_VOLUME),A	; SET VOLUME TO ZERO
 	LD	H,A
 	LD	L,A
-	LD	(PENDING_PERIOD),HL	; SET TONE PERIOD TO ZERO
-;	
+	LD	(AY_PENDING_PERIOD),HL	; SET TONE PERIOD TO ZERO
+;
 	RET
 ;
 ;======================================================================
@@ -165,11 +165,11 @@ AY_RESET:
 ;======================================================================
 ;
 AY_VOLUME:
-	AUDDEBUG("AY3VOL ")
+	AUDTRACE(AYT_VOL)
 	AUDTRACE_L
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 	LD	A,L			; SAVE VOLUME
-	LD	(PENDING_VOLUME), A
+	LD	(AY_PENDING_VOLUME), A
 ;
 	XOR	A			; SIGNAL SUCCESS
 	RET
@@ -179,22 +179,22 @@ AY_VOLUME:
 ;======================================================================
 ;
 AY_PERIOD:
-	AUDDEBUG("AY3PRD ")
+	AUDTRACE(AYT_PERIOD)
 	AUDTRACE_HL
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 
 	LD	A, H			; MAXIMUM TONE PERIOD IS 12-BITS
 	CP	$10			; ALLOWED RANGE IS 0001-0FFF (4095)
 	JP	NC, AY_QUERY_PERIOD1	; RETURN NZ IF NUMBER TOO LARGE
 
-	LD	(PENDING_PERIOD), HL	; SAVE AND 
+	LD	(AY_PENDING_PERIOD), HL	; SAVE AND
 	XOR	A			; SIGNAL SUCCESS
 	RET
 
 AY_QUERY_PERIOD1:
 	LD	L, $FF
-	LD	H, L			; REQUESTED PERIOD IS LARGER 
-	LD	(PENDING_PERIOD), HL	; THAN THE DEVICE CAN SUPPORT
+	LD	H, L			; REQUESTED PERIOD IS LARGER
+	LD	(AY_PENDING_PERIOD), HL	; THAN THE DEVICE CAN SUPPORT
 	OR	L			; SO SIGNAL FAILURE
 	RET
 ;
@@ -203,9 +203,9 @@ AY_QUERY_PERIOD1:
 ;======================================================================
 ;
 AY_NOTE:
-	AUDDEBUG("AY3NOT ")
+	AUDTRACE(AYT_NOTE)
 	AUDTRACE_L
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 
 	ADD	HL, HL			; SHIFT RIGHT (MULT 2) -INDEX INTO AY3NOTETBL TABLE OF WORDS
 					; TEST IF HL IS LARGER THAN AY3NOTETBL SIZE
@@ -236,11 +236,11 @@ AY_NOTE1:
 ;======================================================================
 ;
 AY_PLAY:
-	AUDDEBUG("AY3PLY ")
+	AUDTRACE(AYT_PLAY)
 	AUDTRACE_D
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 ;
-	LD	A, (PENDING_PERIOD + 1)	; CHECK THE HIGH BYTE OF THE PERIOD
+	LD	A, (AY_PENDING_PERIOD + 1)	; CHECK THE HIGH BYTE OF THE PERIOD
 	CP	$FF
 	JR	Z, AY_PLAY1		; PERIOD IS TOO LARGE, UNABLE TO PLAY
 	CALL	AY_APPLY_VOL
@@ -250,13 +250,13 @@ AY_PLAY:
 	RET
 ;
 AY_PLAY1:				; TURN CHANNEL VOL TO OFF AND STOP PLAYING
-	LD	A, (PENDING_VOLUME)
+	LD	A, (AY_PENDING_VOLUME)
 	PUSH	AF
 	XOR	A
-	LD	(PENDING_VOLUME), A
+	LD	(AY_PENDING_VOLUME), A
 	CALL	AY_APPLY_VOL
 	POP	AF
-	LD	(PENDING_VOLUME), A
+	LD	(AY_PENDING_VOLUME), A
 ;
 	OR	$FF			; SIGNAL FAILURE
 	RET
@@ -284,17 +284,17 @@ AY_QUERY:
 ;
 AY_QUERY_CHCNT:
 	LD	B, AY_TONECNT		; RETURN NUMBER OF
-	LD	C, AY_NOISECNT		; TONE AND NOISE 
+	LD	C, AY_NOISECNT		; TONE AND NOISE
 	XOR	A			; CHANNELS IN BC
 	RET
 ;
 AY_QUERY_PERIOD:
-	LD	HL, (PENDING_PERIOD)	; RETURN 16-BIT PERIOD
+	LD	HL, (AY_PENDING_PERIOD)	; RETURN 16-BIT PERIOD
 	XOR	A			; IN HL REGISTER
 	RET
 ;
 AY_QUERY_VOLUME:
-	LD	A, (PENDING_VOLUME)	; RETURN 8-BIT VOLUME
+	LD	A, (AY_PENDING_VOLUME)	; RETURN 8-BIT VOLUME
 	LD	L, A			; IN L REGISTER
 	XOR	A
 	LD	H, A
@@ -320,11 +320,11 @@ AY_APPLY_VOL:
 	ADD	A,AY_R8AVOL		; CHANNEL VOLUME
 	LD	D,A			; REGISTER
 ;
-	AUDTRACE(TRACE_REG_WR)
+	AUDTRACE(AYT_REGWR)
 	AUDTRACE_A
-	AUDTRACE(TRACE_NEWLINE)
+	AUDTRACE_CR
 ;
-	LD	A, (PENDING_VOLUME)	; MAP THE VOLUME
+	LD	A, (AY_PENDING_VOLUME)	; MAP THE VOLUME
 	RRCA				; FROM 00-FF
 	RRCA				; TO 00-0F
 	RRCA
@@ -353,11 +353,12 @@ AY_APPLY_PRD:
 	ADD	A,A			; CHANNEL REGISTER
 	LD	D,A			; FOR THE TONE PERIOD
 ;
-	AUDTRACE(TRACE_REG_WR)
+	AUDTRACE(AYT_REGWR)
 	AUDTRACE_A
-	AUDTRACE(TRACE_NEWLINE)
+	AUDTRACE_CR
+
 ;
-	LD	HL,(PENDING_PERIOD)	; WRITE THE LOWER
+	LD	HL,(AY_PENDING_PERIOD)	; WRITE THE LOWER
 	LD	E,L			; 8-BITS OF THE TONE PERIOD
 	CALL	AY_WRTPSG
 	INC	D
@@ -370,10 +371,10 @@ AY_APPLY_PRD:
 	RET
 ;
 ;======================================================================
-;	
+;
 ; 	WRITE DATA IN E REGISTER TO DEVICE REGISTER D
 ;	INTERRUPTS DISABLE DURING WRITE. WRITE IN SLOW MODE IF Z180 CPU.
-; 
+;
 ;======================================================================
 ;
 AY_WRTPSG:
@@ -388,7 +389,7 @@ AY_WRTPSG:
 	OR	%00110000		; FORCE SLOW OPERATION (I/O W/S=3)
 	OUT0	(Z180_DCNTL),A		; AND UPDATE DCNTL
 #ENDIF
-	LD	A,D			; SELECT THE REGISTER WE 
+	LD	A,D			; SELECT THE REGISTER WE
 	OUT	(AY_RSEL),A		; WANT TO WRITE TO
 	LD	A,E			; WRITE THE VALUE TO
 	OUT	(AY_RDAT),A		; THE SELECTED REGISTER
@@ -405,19 +406,17 @@ AY_WRTPSG:
 ;
 ;======================================================================
 ;
-PENDING_PERIOD		.DW	0	; PENDING PERIOD (12 BITS)
-PENDING_VOLUME		.DB	0	; PENDING VOL (8 BITS)
+AY_PENDING_PERIOD		.DW	0	; PENDING PERIOD (12 BITS)
+AY_PENDING_VOLUME		.DB	0	; PENDING VOL (8 BITS)
 
 #IF AUDIOTRACE
-TRACE_INIT		.DB	"\r\nAY_INIT CALLED\r\n$"
-TRACE_VOLUME_OFF	.DB	"\r\nAY_VOLUME_OFF\r\n$"
-TRACE_VOLUME_SET	.DB	"\r\nAY_VOLUME_SET CH: $"
-TRACE_PLAY		.DB	"\r\nPLAY\r\n$"
-TRACE_VOLUME		.DB	", VOL: $"
-TRACE_REG_WR		.DB	"\r\nOUT AY-3-8910 $"
-TRACE_PERIOD_SET	.DB	"\r\nAY_PERIOD_SET CH: $"
-TRACE_PERIOD		.DB	", PERIOD: $"
-TRACE_NEWLINE		.DB	"\r\n$"
+AYT_INIT		.DB	"\r\nAY_INIT\r\n$"
+AYT_VOLOFF		.DB	"\r\nAY_VOLUME OFF\r\n$"
+AYT_VOL			.DB	"\r\nAY_VOLUME: $"
+AYT_NOTE		.DB	"\r\nAY_NOTE: $"
+AYT_PERIOD		.DB	"\r\nAY_PERIOD $"
+AYT_PLAY		.DB	"\r\nAY_PLAY CH: $"
+AYT_REGWR		.DB	"\r\nOUT AY-3-8910 $"
 #ENDIF
 ;
 ; THE FREQUENCY BY QUARTER TONE STARTING AT A1#
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 3e058bd1..9a4c5073 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -2286,7 +2286,7 @@ SND_ADDENT:
 ;	WORD	UNIT SPECIFIC DATA (TYPICALLY A DEVICE INSTANCE DATA ADDRESS)
 ;
 SND_FNCNT	.EQU	6		; NUMBER OF SND FUNCS (FOR RANGE CHECK)
-SND_MAX		.EQU	2		; UP TO 2 UNITS
+SND_MAX		.EQU	3		; UP TO 2 UNITS
 SND_SIZ		.EQU	SND_MAX * 4	; EACH ENTRY IS 4 BYTES
 ;
 		.DB	SND_FNCNT	; SND FUNCTION COUNT (FOR RANGE CHECK)
@@ -2555,7 +2555,7 @@ SYS_GETRTCCNT:
 	LD	A,(RTC_DISPACT)		; IS RTC ACTIVE?
 	OR	A			; SET FLAGS
 	JR	Z,SYS_GETRTCCNT1	; IF NONE, DONE
-	INC	E			; SET ONE DEVICE 
+	INC	E			; SET ONE DEVICE
 SYS_GETRTCCNT1:
 	XOR	A			; SIGNALS SUCCESS
 	RET
diff --git a/Source/HBIOS/sn76489.asm b/Source/HBIOS/sn76489.asm
index 5d849893..0d7a2936 100644
--- a/Source/HBIOS/sn76489.asm
+++ b/Source/HBIOS/sn76489.asm
@@ -69,13 +69,13 @@ SN7_INIT1:
 ;
 
 SN7_RESET:
-	AUDTRACE(TRACE_INIT)
+	AUDTRACE(SNT_INIT)
 	CALL	SN7_VOLUME_OFF
 	XOR	A			; SIGNAL SUCCESS
 	RET
 
 SN7_VOLUME_OFF:
-	AUDTRACE(TRACE_VOLUME_OFF)
+	AUDTRACE(SNT_VOLOFF)
 
 	LD	A, CHANNEL_0_SILENT
 	OUT	(SN76489_PORT_LEFT), A
@@ -103,11 +103,11 @@ SN7_VOLUME_OFF:
 ; 1 CC 1 VVVV
 
 SN7_VOLUME:
-	AUDDEBUG("SN7VOL ")
+	AUDTRACE(SNT_VOL)
 	AUDTRACE_L
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 	LD	A, L
-	LD	(PENDING_VOLUME), A
+	LD	(SN7_PENDING_VOLUME), A
 
 	XOR	A			; SIGNAL SUCCESS
 	RET
@@ -115,9 +115,9 @@ SN7_VOLUME:
 
 
 SN7_NOTE:
-	AUDDEBUG("SN7NOT ")
+	AUDTRACE(SNT_NOTE)
 	AUDTRACE_L
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 
 	ADD	HL, HL			; SHIFT RIGHT (MULT 2) -INDEX INTO SN7NOTETBL TABLE OF WORDS
 					; TEST IF HL IS LARGER THAN SN7NOTETBL SIZE
@@ -144,32 +144,32 @@ SN7_NOTE1:
 	RET
 
 SN7_PERIOD:
-	AUDDEBUG("SN7PRD ")
+	AUDTRACE(SNT_PERIOD)
 	AUDTRACE_HL
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 
 	LD	A, H
 	CP	$04
 	JP	NC, SN7_QUERY_PERIOD1	; RETURN NZ IF NUMBER TOO LARGE
 
-	LD	(PENDING_PERIOD), HL
+	LD	(SN7_PENDING_PERIOD), HL
 	XOR	A			; SIGNAL SUCCESS
 	RET
 
 SN7_QUERY_PERIOD1:			; REQUESTED PERIOD IS LARGER THAN THE SN76489 CAN SUPPORT
 	LD	L, $FF
 	LD	H, $FF
-	LD	(PENDING_PERIOD), HL
+	LD	(SN7_PENDING_PERIOD), HL
 
 	OR	$FF			; SIGNAL FAILURE
 	RET
 
 SN7_PLAY:
-	AUDDEBUG("SN7PLY ")
+	AUDTRACE(SNT_PLAY)
 	AUDTRACE_D
-	AUDDEBUG("\r\n")
+	AUDTRACE_CR
 
-	LD	A, (PENDING_PERIOD + 1)
+	LD	A, (SN7_PENDING_PERIOD + 1)
 	CP	$FF
 	JR	Z, SN7_PLAY1		; PERIOD IS TOO LARGE, UNABLE TO PLAY
 	CALL	SN7_APPLY_VOL
@@ -179,13 +179,13 @@ SN7_PLAY:
 	RET
 
 SN7_PLAY1:				; TURN CHANNEL VOL TO OFF AND STOP PLAYING
-	LD	A, (PENDING_VOLUME)
+	LD	A, (SN7_PENDING_VOLUME)
 	PUSH	AF
 	LD	A, 0
-	LD	(PENDING_VOLUME), A
+	LD	(SN7_PENDING_VOLUME), A
 	CALL	SN7_APPLY_VOL
 	POP	AF
-	LD	(PENDING_VOLUME), A
+	LD	(SN7_PENDING_VOLUME), A
 
 	OR	$FF			; SIGNAL FAILURE
 	RET
@@ -214,12 +214,12 @@ SN7_QUERY_CHCNT:
 	RET
 
 SN7_QUERY_PERIOD:
-	LD	HL, (PENDING_PERIOD)
+	LD	HL, (SN7_PENDING_PERIOD)
 	XOR	A
 	RET
 
 SN7_QUERY_VOLUME:
-	LD	A, (PENDING_VOLUME)
+	LD	A, (SN7_PENDING_VOLUME)
 	LD	L, A
 	LD	H, 0
 
@@ -251,7 +251,7 @@ SN7_APPLY_VOL:				; APPLY VOLUME TO BOTH LEFT AND RIGHT CHANNELS
 	OR	$90
 	LD	B, A
 
-	LD	A, (PENDING_VOLUME)
+	LD	A, (SN7_PENDING_VOLUME)
 	RRCA
 	RRCA
 	RRCA
@@ -264,9 +264,9 @@ SN7_APPLY_VOL:				; APPLY VOLUME TO BOTH LEFT AND RIGHT CHANNELS
 	AND	$0F
 	OR	B			; A CONTAINS COMMAND TO SET VOLUME FOR CHANNEL
 
-	AUDTRACE(TRACE_PORT_WR)
+	AUDTRACE(SNT_REGWR)
 	AUDTRACE_A
-	AUDTRACE(TRACE_NEWLINE)
+	AUDTRACE_CR
 
 	OUT	(SN76489_PORT_LEFT), A
 	OUT	(SN76489_PORT_RIGHT), A
@@ -279,7 +279,7 @@ SN7_APPLY_PRD:
 	PUSH	DE
 	PUSH	BC
 	PUSH	AF
-	LD	HL, (PENDING_PERIOD)
+	LD	HL, (SN7_PENDING_PERIOD)
 
 	LD	A, D
 	AND	$3
@@ -295,9 +295,9 @@ SN7_APPLY_PRD:
 	AND	$F
 	OR	B			; A NOW CONATINS FIRST PERIOD COMMAND
 
-	AUDTRACE(TRACE_PORT_WR)
+	AUDTRACE(SNT_REGWR)
 	AUDTRACE_A
-	AUDTRACE(TRACE_NEWLINE)
+	AUDTRACE_CR
 
 	OUT	(SN76489_PORT_LEFT), A
 	OUT	(SN76489_PORT_RIGHT), A
@@ -318,9 +318,9 @@ SN7_APPLY_PRD:
 	RLCA				; AND PLACE IN BITS 5 AND 6
 	OR	B			; OR THE TWO SETS OF BITS TO MAKE 2ND PERIOD COMMAND
 
-	AUDTRACE(TRACE_PORT_WR)
+	AUDTRACE(SNT_REGWR)
 	AUDTRACE_A
-	AUDTRACE(TRACE_NEWLINE)
+	AUDTRACE_CR
 
 	OUT	(SN76489_PORT_LEFT), A
 	OUT	(SN76489_PORT_RIGHT), A
@@ -344,24 +344,22 @@ SN7_FNTBL:
 	!!!!!
 #ENDIF
 
-PENDING_PERIOD
+SN7_PENDING_PERIOD
 	.DW	0		; PENDING PERIOD (10 BITS)
-PENDING_VOLUME
+SN7_PENDING_VOLUME
 	.DB	0		; PENDING VOL (8 BITS -> DOWNCONVERTED TO 4 BITS AND INVERTED)
 
 STR_MESSAGELT	.DB	"\r\nSN76489: LEFT IO=0x$"
 STR_MESSAGERT	.DB	", RIGHT IO=0x$"
 
 #IF AUDIOTRACE
-TRACE_INIT		.DB	"\r\nSN7_INIT CALLED\r\n$"
-TRACE_VOLUME_OFF	.DB	"\r\nSN7_VOLUME_OFF\r\n$"
-TRACE_VOLUME_SET	.DB	"\r\nSN7_VOLUME_SET CH: $"
-TRACE_PLAY		.DB	"\r\nPLAY\r\n$"
-TRACE_VOLUME		.DB	", VOL: $"
-TRACE_PORT_WR		.DB	"\r\nOUT SN76489, $"
-TRACE_PERIOD_SET		.DB	"\r\nSN7_PERIOD_SET CH: $"
-TRACE_PERIOD		.DB	", PERIOD: $"
-TRACE_NEWLINE		.DB	"\r\n$"
+SNT_INIT		.DB	"\r\nSN7_INIT\r\n$"
+SNT_VOLOFF		.DB	"\r\nSN7_VOLUME OFF\r\n$"
+SNT_VOL			.DB	"\r\nSN7_VOLUME: $"
+SNT_NOTE		.DB	"\r\nSN7_NOTE: $"
+SNT_PERIOD		.DB	"\r\nSN7_PERIOD: $"
+SNT_PLAY		.DB	"\r\nSN7_PLAY CH: $"
+SNT_REGWR		.DB	"\r\nOUT SN76489, $"
 #ENDIF
 
 ; THE FREQUENCY BY QUARTER TONE STARTING AT A1#