|Microsoft DirectX 9.0|
The SetNumChannelGroups method changes the number of channel groups that the application needs on the port.
HRESULT SetNumChannelGroups( DWORD dwChannelGroups );
Number of channel groups on this port that the application wants to allocate.
If the method succeeds, the return value is S_OK.
If it fails, the method can return one of the error values shown in the following table.
Header: Declared in dmusicc.h.