Error 0x8878112F

Value: -2005397201 | 0x8878112F | 2289570095

What does it mean ?

DMUS_E_ALREADYOPEN  
An attempt was made to open the software synthesizer while it was already open.
Value: 4399 | 0x112F | 0b0001000100101111

Where does it come from ?

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

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