Qu32 doesn't connect to USB MIDI host using microchip PIC24

Qu Qu DAW Integration
1

The microchip works with a midi music keyboard, but won’t work with the Qu32. We’ve also got a PC to communicate using MIDI OX.

2

Surprise, it’s not a keyboard, it’s a mixer.

3

What is different about the MIDI connection for the Qu32 from any other midi device?