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BF25: Play High Tone
Used by the routines at CollectPickup and NewHighScore_Return.
Plays a steady tone of 30 cycles, using 40 as the pitch delay.
PlayHighTone BF25 LD BC,$4030 Set the half-period in B to 40 and the number of cycles in C to 30.
BF28 JR PlayWaveSequence Jump to PlayWaveSequence to play the tone.
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