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B2C5: Play one note of a tune that a key can stop
Used by the routine at play_audio_until_keypress.
keypress_tune_note B2C5 LD A,(DE) $FF ends the tune
B2C6 CP $FF
B2C8 JR Z,end_audio
B2CA CALL play_note play the note, then look at the keyboard again
B2CD JR play_audio_until_keypress
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