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D744: Send channel volume command
Used by the routine at D6DB.
D744 LD A,($D857) Set channel volume register into D
D747 ADD A,$07
D749 LD D,A
D74A LD E,(IX+$07) Set E the volume value (bits 7-4)
D74D SRL E
D74F SRL E
D751 SRL E
D753 SRL E
D755 CALL $D759 Send command to AY-3-8912
D758 RET
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