I’m really puzzled by this and after the similar thread about ardour I thought I would ask here about renoise specifically.
In renoise on linux if you have a plugin window open then you cannot use the computer keyboard to play the plugin.
Did a few more tests. The missing “LXVSTPluginUI::forward_key_event” implementation really seems to be the problem here:
Ardour’s window, which hosts the plugin window, grabs away key events, so Redux does not receive any key events.
This sounds like the exact problem that renoise has with plugins. I have asked a few people and I never really get a specific answer about why this happens, just that it is normal and they get the same thing.