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D5D7: Reset the 3 channel volumes of the AY-3-8912
Used by the routines at 97C3, 97EA, A4E7, C745, D5AE and D871.
D5D7 LD E,$00 Set E to the volume value
D5D9 LD D,$08 Set D to the sound register for channel 1
D5DB CALL $D759 Reset volume of channel 1
D5DE INC D Set D to the sound register for channel 2
D5DF CALL $D759 Reset volume of channel 2
D5E2 INC D Set D to the sound register for channel 3
D5E3 CALL $D759 Reset volume of channel 3
D5E6 RET
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