You could give lbx stripper a try. It's a script from Lb0 wich is very stable and responded to all my need for switching/ tweaking tracks live.
You can build a strip with every fx/track control you need for your show and use snapshots to switch smoothly beetween scenes. It can do macros and modulations too. And it can control SENDS!!!
Sadly, As often in reaper, it has its learning curve... And manual is videos, but it delivers.
That said Cantabile looks nice and seems to be taylored for that use. Hope you find your tool...