I have reported this before, but it’s a major issue, so i will post about it again in this new forum.
It’s unfortunately not possible to select a midi channel for Arturias VST3 plugins in Studio One. It’s possible for some other VST3 plugins, so it look like a Arturia issue.
It’s also possible with Arturias VST2 plugins, but they do not accept Studio Ones new Sidechain input like the VST3 does. Studio One give VST3 priority for Arturias plugins as they apparantly share the same ID, so it’s not possible to access both VST2 and VST3 versions.
So it’s in example not possible to access all b3’s manuals - one for each track in the DAW using different midi channels. So you have to use a plugin for each manual, instead of using the same plugin for all manuals.