Int 66 Fn 068D  - Ibmsnd Driver, Digpak - Report Current Sample Address    [s]

   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

See Also: AX=068Ch,AX=0691h