rewrote main loop, cleaned up stuff, B button to step one frame

Code/nintendo-out.asm

@@ -18,14 +18,6 @@ ScrollNintendoOut:
 	dec b
 	jr nz, .wait
 	
-	; sound ON
-	ld a, $80
-	ldh [rNR52], a
-	ld a, $77
-	ldh [rNR50], a ; max volume on both speakers
-	ld a, $88
-	ldh [rNR51], a ; noise channel on both speakers
-
 	; make noise
 	xor a
 	ldh [rNR41], a ; set sound duration
@@ -93,8 +85,4 @@ ScrollNintendoOut:
 	cp a, 88
 	jp nz, .scrollup
 	
-	; sound off
-	xor a
-	ldh [rNR52], a
-	
 	ret