Question: Could it be that the ground pin has been disconnected in the uTrack24?
I think the Roland A-880 and the Synths I am using (Roland and Korg) add a ground connection to all MIDI ports on its own, and the Mio10 does not have that hardware feature.[/quote]
The Midi pinout is the following:
2 shield –> Connected to the GND (150R and 100nF)