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 🙂