My current setup is Zynthian v5.1, Circuit Tracks and Korg SV-1 as Masterkeyboard. Everything connected to Zynthian via USB/Midi. I use Zynthian as a Keyboard expander and next goal is to explore Zynseq. Playing live and use some recorded sequences via Zynseq in the background. And 2nd option is to to use Circuit Tracks for sequencing chains in Zynthian. Sustain pedal is necessary to be recorded when sequencing instruments.
If I can help to test/check relevant updates just let me know.