INT 66 - IBMSND driver, DIGPAK - REPORT CURRENT SAMPLE ADDRESS                  
	AX = 068Dh
Return: AX = current playback address
Desc:	determine what point in the audio data the playback has reached, for
	  synchronization with video or animation effects
Notes:	this function applies to background playback only
	the reported address may be an approximation rather than the exact
	  address
SeeAlso: AX=068Ch,AX=0691h