|Microsoft DirectX 9.0|
The SetExternalMasterClock method sets the DirectMusic master clock to an existing clock object. There is only one master clock for all DirectMusic applications.
HRESULT SetExternalMasterClock( IReferenceClock *pClock );
IReferenceClock interface pointer that specifies the clock.
If the method succeeds, the return value is S_OK.
If it fails, the method can return DMUS_E_PORTS_OPEN.
If another running application is also using DirectMusic, it is not possible to change the master clock until that application is shut down.
Header: Declared in dmusicc.h.