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64E7: Play Mid Tone
Used by the routines at GamePlayEntry and SpawnBonusItem.
Plays 40 square waves with a duration of 30.
PlayMidTone 64E7 LD D,$30 Set the duration of the wave in D to 30.
64E9 LD C,$40 Set the wave counter in C to 40.
64EB JR PlayTone_Loop Jump to PlayTone_Loop.
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