Error 0x88781121

Value: -2005397215 | 0x88781121 | 2289570081

What does it mean ?

DMUS_E_ALREADY_DOWNLOADED  
Buffer was already downloaded to synth.
Value: 4385 | 0x1121 | 0b0001000100100001

Where does it come from ?

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

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