The IDirectMusicSegmentState::GetStartPoint method returns the offset into the segment state at which play begins or began.
HRESULT GetStartPoint(
  MUSIC_TIME * pmtStart
);
 If the method succeeds, the return value is S_OK.
If it fails, the method may return E_POINTER.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dmusici.h.
IDirectMusicSegment::SetStartPoint, IDirectMusicSegmentState::GetStartTime