OK krakile! You are talking about kind of MPE. Zynthian currently doesn’t support MPE but it’s a long awaited feature we would like to implement. Indeed, the internals are ready for it.
FYI, zynthian already includes a MPE capable synthesizer, Surge XT, but It can’t be used for MPE until chains can listen several MIDI channels.
Indeed Surge XT has been choosed by Roger Linn as the official synth for his LinnStrument:
https://www.rogerlinndesign.com/support/ls-surge
Please, open a feature request and i will prioritize this as soon we land current opened tasks. Perhaps we could have basic MPE support by 2025’s springtime.
All the best