Empty rack effect THRU module/plug in
I currently use an external effect-vocal processor which is available thru output 6 on my CQ20. Yea no real problem there for global mix fed via output 6 mix etc.
So my suggestion, hoping its a software routing solution is the ability to insert a feed as you would if using onboard effects, or indeed as a global effect in the rack.
Example, currently an empty effects rack slot has no output, creating a thru effect device as in has no effect itself, could be selected as an insert, that could then have its output level to output 6 for instance, giving you an insert or indeed an effect in the rack thats actually external.
My goal is a radio effect for a particular song where I dont really want the original signal and 100% effect mix on that channel only.