c4 synth expression pedal zoom b1 four x

I can't seem to find any info on an existing thread, so I decided to start a new one. I have a Zoom B1 four X with a built-in expression pedal. It's next to useless on the Zoom, so I'm considering hacking into it, and using it on my C4 synth pedal instead. I can see inside, that the wiring...