I am currently working on a PCB / kit for my Korg Polysix mod. It will be available soon and feature both mods: portamento and spread detune.
This is a design for a front panel – Polysix style:
It could look like this:
And here is a rendering of the PCB:
Currently a prototype board is being produced, for some last checks before a larger order of boards.
If you are interested, have any suggestions or questions, let me know in the comments 🙂