- I’m running a Soundblaster with a PicoGUS in the same PC, and often use the PicoGUS for MPU-401 with MIDI devices. Because of this the Soundblaster’s MPU-401 is off, but
diagnosewon’t complete if it can’t detect it. Turns out there’s a hidden flag to completediagnosewithout it — just rundiagnose /dmpuand all is good.