The IDirectMusicBuffer::GetStartTime method retrieves the start time of the data in the buffer, relative to the master clock.
HRESULT GetStartTime(
  LPREFERENCE_TIME prt
);
 If the method succeeds, the return value is S_OK.
If it fails, the method may return one of the following error values:
| DMUS_E_BUFFER_EMPTY | 
| 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 dmusicc.h.
IDirectMusicBuffer::SetStartTime, IDirectMusicBuffer::TotalTime