> I was able to pry the controller apart. It is a C channel inside
> a c-channel (and then you can access the usb because that part of
> the pcb is open (the innner c-channel is shorter than the outer one).
> The issue with opening everything up was due to the paint used
> (it kind of glued things together)
>
> I have re-soldered the usb and now it is nice and solid.
>
> Everything works now except one function: CV
>
> On the A-198 module the gate, pressure gate and pressure cv all
> work, the only thing that doesn't is the pitch CV.
>
> Any clues what may cause this

The 4 pins of the USB connector have these functions: GND, pressure CV (D+),
position CV (D-), Vref (about +5V).
You should be able to measure the two voltages for pressure and position on
the two pins of the USB socket when you touch the manual. If these voltages
are OK probable the R2M box is defective and has to be repaired. You may try
also another USB cable.

Best wishes
Dieter Doepfer