Here’s one of the posts from the link @le51 provided. I think this one would be good to start with as it covers the bulk of the required steps to prepare a PD patch to work with zynthian. Adapt pd files for Zynthian - #9 by ronsum
I studied the patch you want to modify. You can get most of it working on zynthian with about 8 controls.
1.) Volume 2.) Midi Clock (Int/Ext) 3.) Tempo 4.) Compressor (On,Off)
5.) Tamb. Level 6.) Guiro Level 7.)Rhythm/Pattern 8.) Start/Stop
I’m leaving out the Bass Cymbol and Snare mutes, but they could be added if you wanted to. If you want to display the Rhythm names on the zynthian, that will be the most time consuming, but not too difficult. The patch will need some modification to get 5, 6 and 7 working, but that will be simple. If you need help with that, I’ll explain further. I went ahead and make a control patch you will need to add:
midicontrol.pd (1.7 KB)
Of course you will also need to write a yaml file to make the controls show up on the zynthian screen.