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B423: One step of the materialising sweep
materialise_sweep B423 LD A,C half-wave count 4 * C: shorter, so higher, as C falls
B424 RLCA
B425 RLCA
B426 LD B,A
B427 CALL toggle_audio_hw
B42A DEC C until C runs out
B42B JR NZ,materialise_sweep
B42D RET
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