=> R0 = sound volume (1-127) (0 to read setting)
<= R0 = previous volume
This call sets the maximum overall volume of the Sound system. A change of 16 will halve or double the volume. The command also scales the internal volume lookup tables of the Voice Generators, which involves a large amount of calculation behind the scenes. The default volume is stored within CMOS byte 148.
See PRM 4, page 25.
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