I've been running Pianoteq on a Raspi for a bit (still amazed that it's even possible!) -- but missed having some physical controls, as my piano, a Korg D1, has no MIDI sliders nor rotary encoders.

So I built myself this pianoteq-in-a-box-with-knobs:

The interface you see has been working for a couple years for me, but it's only this week (and with LLM help) that I finally put the finishing touches on it.

It's written in Rust and FLTK for minimal CPU usage, talks to Pianoteq 8 (not tested with 9!) over JSONRPC and controls ALSA volume directly. The encoders are connected over the I2C bus.

I am not committing to maintaining the code, but thought maybe someone could still find it useful for their own setup, so here it is:

https://github.com/polymeris/uteq

Next goal: make a decent-looking enclosure