Error 0x88781125

Value: -2005397211 | 0x88781125 | 2289570085

What does it mean ?

DMUS_E_NOTMONO  
Wave chunk has more than one interleaved channel. DLS format requires MONO.
Value: 4389 | 0x1125 | 0b0001000100100101

Where does it come from ?

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

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