Hi
I couldn’t find the exact details in the updated features list but. . . we appear to live (i.e. manual) updating of FX opts, while loops are playing? Correct? Frikn awesome!!
PD-Pi
Sadly I think Sam has taken this feature out again. He found there were too many gremlins in the thread system as a result. IT was there briefly at the begining of 5.0dev but it is no longer in the latest build.
Lang - reluctantly roll back support for changing the FX context of a…
… live loop This unfortunately introduced too many subtle bugs. I think I either need to have another go from scratch - or more likely - the whole threading model needs properly re-designing and re-building 
Ah, apologies for the potentially misleading post then @robin.newman
We do appreciate the continuing work the core team is doing, to keep Sonic Pi live and relevant.
PD-Pi