=> R0 = new overall volume (0-64) or -1 to read current volume
<= R0 = previous volume (0-64)
This SWI allows you set the overall output volume from the QTM sound handlers. The volume is in a linear form (0-64), as used for volumes in ProTracker songs. Gradual fades can be generated using this SWI.
V flag set if volume is out of range
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