Everyone's a Wally: Routine at 58348

58348: Play square wave sound.

Used by the routine at PlayWaveSequence.
Flip speaker on (set bit 4).
PlaySquareWave	58348	LD A,%00010000	A=16 (speaker on = bit 4).
	58350	OUT (254),A	A=16 (speaker on = bit 4).
	58352	PUSH BC	Stash BC on the stack.
PlaySquareWave_Loop	58353	DJNZ PlaySquareWave_Loop	Decrease duration by one and loop back to PlaySquareWave_Loop until counter is zero.
	58355	POP BC	Restore BC from the stack.
Flip speaker off (unset bit 4).
	58356	LD A,%00000000	A=0 (speaker off).
	58358	OUT (254),A	A=0 (speaker off).
	58360	PUSH BC	Stash BC on the stack.
Silence_Loop	58361	DJNZ Silence_Loop	Decrease duration by one and loop back to Silence_Loop until counter is zero.
	58363	POP BC	Restore BC from the stack.
	58364	RET	Return.