How do I get ZynAddSubFX bank selection to stick?

I add midi track with the ZynAddSubFX instrument plugin. I browse during the many banks and sounds availabe and finally settle for one.
I close the plugin screen and record someting in the midi track with the selected sound.

I save. Next time I open the session in Ardour 9 the track with the ZynAddSubFX has reverted to some default bank, not the one I used before.

Anybody knows what am I missing here to make bank selection stick?

You need to insert a patch change at the beginning of the track or region to select the patch you want.

Thanks for the suggestion. Althoug it does not seem to work with this synth plugin. I get the generic Midi Patches to choose from but not what the plugin actually has on offer.

Like with SurgeXT or OB-Xd Plugins, what bank/patch I select in the plugin stays active in the track. But that Syn plugin doesn’t do that.

Nope, it should work. I use zyn a lot and I never add patch change to the track. Same for every instrument.

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Probably a good idea to back up and get some basic information.
Which operating system?
Which Ardour build and version? From ardour.org, from a linux distribution, built yourself, etc.
Which plugin format?

Thanks. So I went ahead and installed ardour 9 on a second machine and added the zyn plugin and it works!

Guess I have to take apart the installation on the other machine where it doesn’t work the same way.

Both run EndeavourOS Linux with KDE/Wayland.
I have ardour-9 installed via ardour-git from AUR.
Big difference is the list of plugins. That’s probably where I should start looking.

Thank you