Error 0x88781132

Value: -2005397198 | 0x88781132 | 2289570098

What does it mean ?

DMUS_E_SYNTHACTIVE  
The operation cannot be carried out while the synthesizer is active.
Value: 4402 | 0x1132 | 0b0001000100110010

Where does it come from ?

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

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