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B47D: One step of the warble
transform_warble B47D LD A,C half-wave count (C XOR $55) + C, one wave
B47E XOR $55
B480 ADD A,C
B481 LD B,A
B482 CALL toggle_audio_hw
B485 DEC C until C runs out
B486 JR NZ,transform_warble
B488 RET
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