Error 0x88781103

Value: -2005397245 | 0x88781103 | 2289570051

What does it mean ?

DMUS_E_DEVICE_IN_USE  
The requested device is already in use (possibly by a non-DirectMusic client), and cannot be opened again.
Value: 4355 | 0x1103 | 0b0001000100000011

Where does it come from ?

FACILITY_DIRECTMUSIC  
Direct Music (part of DirectX) - Audio
Value: 2168 | 0x878 | 0b100001111000

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