| Platform SDK: DirectX | 
The IDirectSoundBuffer::GetFrequency method retrieves the frequency, in samples per second, at which the buffer is playing.
HRESULT GetFrequency( LPDWORD lpdwFrequency );
If the method succeeds, the return value is DS_OK.
If the method fails, the return value may be one of the following error values:
| DSERR_CONTROLUNAVAIL | 
| DSERR_INVALIDPARAM | 
| DSERR_PRIOLEVELNEEDED | 
The frequency value will be in the range of DSBFREQUENCY_MIN to DSBFREQUENCY_MAX. These values are currently defined in Dsound.h as 100 and 100,000 respectively.
  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dsound.h.
  Import Library: Use dsound.lib.