diff --git a/Source/Apps/Tune/cli.inc b/Source/Apps/Tune/cli.inc
index b08fdd52..9f8b2551 100644
--- a/Source/Apps/Tune/cli.inc
+++ b/Source/Apps/Tune/cli.inc
@@ -13,10 +13,10 @@ CLI_HAVE_HBIOS_SWITCH:
 	JR	NZ, CLI_HAVE_HBIOS_SWITCH1
 	OR	$FF			; MATCHED --HBIOS 
 	LD	(HBIOSMD), A
-	LD	BC,(BF_SYSGET*256)+BF_SND	; CHECK WE HAVE
-	RST	08
-	XOR	A
-	CP	E
+	LD	BC,(BF_SYSGET*256)+BF_SND
+	RST	08			; CHECK WE HAVE
+	XOR	A			; AT LEAST ONE
+	CP	E			; SOUND DEVICE
 	RET	NZ
 	JP	ERRHW
 CLI_HAVE_HBIOS_SWITCH1			; NOT MATCHED --HBIOS