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47394: 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 47394 DEC (IX+3) Decrease *IX+3 by one.
47397 JR Z,EndSound Jump to EndSound if zero.
47399 LD C,(IX+3) C=*IX+3 (pitch).
47402 LD D,(IX+2) D=*IX+2 (repeat count).
Continue on to PlayWaveSequence.
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