=> R0 = new overall volume (0-127) or -1 to read volume
<= R0 = old volume
This SWI will set the overall volume of any tunes playing by subtracting (254-volume*2) from the volume of any sample playing. This takes effect immediately, and also affects samples which are in mid-play. Calling the SWI with R0=-1 will return the current volume in R0. You can use this SWI to provide smooth fade-outs and fade-ins, for example.
This SWI is part of the locking system.
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