Discussion about the Korg PolySix synthesizer

(sorry if this appears more than once... I'm having issues posting)
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Does anyone know if it would be feasible and not too difficult to replace the mod wheels from the Polysix by the Joystick from the Poly-61 ?

Both modules look the same in terms of space, but what about the electrical/electronic aspects of a simple swap?
To they use/provide same voltages, etc...

I kinda like the joystick.

Ideally, this should be a reversible mod, if possible.

Thanks!

-Chris, from Synthosphere