INT 62 u - FGDRIVER v4.02 - "FG_QUIET" - STOP CONTINUOUS SYNCHRONOUS SOUND
	AX = 009Ah
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	This call has no effect if there is no continuous sound playing
SeeAlso: AX=0059h,AX=0080h,AX=00BDh,AX=00DCh