Just to mention (again): OpenStageControl

http://osc.ammd.net/

Very cool control interface for MIDI/OSC.

what is needed to connect it with a zynthian?

I think you only have to know the target IP and OSC pathes. Or MIDI channel/CC… but havn’t tested yet.

Nothing … if you run the electron app in your table you could connect it as an USB-MIDI device …
If using OSC, you use your local network or direct link, but currently only ZynAddSubFX is listening OSC.

I think it could run inside zynthian, allowing the easy creation of new and powerful touch-interfaces, but performance could be a problem …

Regards