diff --git a/libsrc/atari/sound.s b/libsrc/atari/sound.s
index eb90662ad..756d0e02d 100644
--- a/libsrc/atari/sound.s
+++ b/libsrc/atari/sound.s
@@ -9,31 +9,31 @@
         .import         popa
 ; play sound, arguments: voice, pitch, distortion, volume. same as BASIC
 .proc  _sound
-       sta STORE2    ;save volume
-       jsr popa      ;get distortion
-       sta STORE1    ;save distortion 
-       jsr popa      ;get pitch
-       pha           ;save in stack
-       jsr popa     ;get voice
-       asl a        ;adjust voice *2 for offset in x
-       tax 
-       pla          ;get pitch from stack
-       sta AUDF1,x  ; store pitch
-       lda #0
-       sta AUDCTL
-       lda #3
-       stx SKCTL    ;init sound
-       lda STORE1    ;get distortion
-       asl a         ;ignore the high nibble
-       asl a 
-       asl a 
-       asl a
-       clc           ; setup for adding volume 
-       adc STORE2    ; add volume
-       sta AUDC1,x   ; volume + distortion in control channel
-       rts
+        sta STORE2      ;save volume
+        jsr popa        ;get distortion
+        sta STORE1      ;save distortion 
+        jsr popa        ;get pitch
+        pha             ;save in stack
+        jsr popa        ;get voice
+        asl a           ;adjust voice *2 for offset in x
+        tax 
+        pla             ;get pitch from stack
+        sta AUDF1,x     ;store pitch
+        lda #0
+        sta AUDCTL
+        lda #3
+        stx SKCTL       ;init sound
+        lda STORE1      ;get distortion
+        asl a           ;ignore the high nibble
+        asl a 
+        asl a 
+        asl a
+        clc             ;setup for adding volume 
+        adc STORE2      ;add volume
+        sta AUDC1,x     ;volume + distortion in control channel
+        rts
 .endproc
-; reserve 2 bytes for temp storage
+                        ;reserve 2 bytes for temp storage
            .bss
-STORE1:    .res    1
-STORE2:    .res    1
+STORE1: .res    1
+STORE2: .res    1