I think Solo version supports “Solo” mode operation, if so, the following examples show how to set up radio buttons from your foot controller
At Song level route your fc300 to the embedded rack (I’m using Main Keyboard for my control buttons)
Rack 1 opened to routing page The big "S: is for Solo and is Illuminated on the first plugin (VB3_x64 1)
rack 1 opened to bindings page and showing the bindings from the controller to each plugin. type The key is to use the ‘Solo Exclusive’ Binding.
Hope this helps