have you tried Magic music visuals??
you can route channels from Reaper using rearoute to control visuals
you have midi control over the visuals...
not sure if thats what you were wanting??
theres a trial version you could download to trial it
heres a couple of demos i did with the trial version a while back using magic music visuals tied with reaper
https://www.youtube.com/watch?v=n61Fp-s7zTI
https://www.youtube.com/watch?v=3UOSSjtVspY