Add new comment

You should try the "MIDI-OX" application and detect what is coming out of your USB keyboard.
I have a Behringer UMX49 here and it keeps sending "CC: Volume" messages,

When I use Sylenth1 VST, it makes the volume jump all over the place.

I thought it was the electronic glider (volume up/down) but the USB keyboard still sends thos codes even after unsoldering the electronic element inside the USB keyboard (unplug from electronic PCB board)

I don't know what to do.
.