i recently downloaded the official ardour 6.5 binary on ubuntu studio, and i noticed that some plugins, including the rncbc v1 plugins (i.e., synthv1, padthv1, etc.) simply return a blank bus with a fader when i try to load them
I haven’t been able to get any of the v1 plugins to work in over a year. I tossed in the towel with them a while ago … the dude that builds them is a super nice, pretty responsive guy but I found they just aren’t my bag for plugins.
At first glance, and I could be wrong, but it appears the plugins are dynamically linked, and there may be a mismatch between what it expects for Qt on your system, and what is there. That being said I believe most plugins should be statically linked, which is counter to most things on Linux, and as a result of the two conflicting philosophies you can have issues.