You _could_ do this by creating two Venue Presets*) with the respective Roles and rely on the Auto Apply feature, but actually I would simply duplicate the two violin channels and use the channel selection features of your DAW or hosting app. This would allow for gapless switching. - Hint: Make sure to carefully match gains, as louder is always "better" for the human ear. 😉 ...)
*) ... then double-click its entrance in the preset browser on the left, or drag-n-drop the preset to the active Venue slot on the right. Maybe this quck'n'dirty screen-cast I created some time ago helps to get the idea accross:
-> https://youtu.be/Gtjixx17FKE
HTH,
/Dietz - Vienna Symphonic Library