INT 62 u - FGDRIVER v3.03 - "FG_QUIET" - STOP CONTINUOUS SYNCHRONOUS SOUND
        AX = 007Fh
Notes:  For FGDRIVER v1.10, this function was "FG_MOUSEPTR" (see AX=0065h);
          "FG_QUIET" was AX=0090h
        This call has no effect if there is no continuous sound playing
SeeAlso: AX=0048h,AX=006Ah,AX=009Eh,AX=00ABh

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