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B922: Tick Wave Duration
Decrease the current wave's pitch and finish the effect when it reaches zero.
Input
IX Sound slot
Decrease the current wave pitch and finish if it is zero.
TickWaveDuration B922 DEC (IX+$03) Decrease *IX+03 by one.
B925 JR Z,EndSound Jump to EndSound if zero.
B927 LD C,(IX+$03) C=*IX+03 (pitch).
B92A LD D,(IX+$02) D=*IX+02 (repeat count).
Continue on to PlayWaveSequence.
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