Sets the track speed. The track speed is similar to a multiplier that is used to speed up or slow down the playback of the track.
HRESULT SetTrackSpeed( UINT Track, FLOAT Speed );
If the method succeeds, the return value is S_OK. If the method fails, the return value can be one of the following values: D3DERR_INVALIDCALL, E_OUTOFMEMORY.
Header: Declared in D3dx9anim.h.