Routines
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9EB7: Play Rising Sweep
Used by the routine at CollectItem.
Plays a sweep of clicks which get shorter, so the pitch rises.
PlayRisingSweep 9EB7 LD B,$FF Start the sweep with a length of FF.
PlayRisingSweep_Click 9EB9 CALL PlayClick Play a click.
9EBC DJNZ PlayRisingSweep_Click Shorten the length and jump back until the sweep has finished.
9EBE RET Return.
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