Function 28 - set SB16 volume.
Parameters:
- eax = 28 - function number
- ebx = what to install:
- 1 - install common volume
- 2 - install CD-audio volume
- cl = volume level (0=off, 0xFF=max)
Returned value:
- eax = 0 - success
- eax = 1 - SB base is not defined
- eax = 2 - incorrect subfunction
Remarks: