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I think it’s really a gain staging question.
You could send all the signal you want as long as you don’t overload the input to the verb. If you clip the verb input, that nasty digital schmutz will be baked into the verb return no matter what level you choose to use at the fader. You will have boxed yourself into a corner of somewhere between quiet distortion or “Oh Fuck!” fader dependent. In the old days, analog gear would be quieter when operating at healthy, but below clipping levels. The newfangled digital stuff seems to have a much better S/N ratio allowing a bit of slop in gain staging. There’s an argument to be made that the resolution of the reverb would be finer if all the digital bucket is filled with signal. No idea how audible that would be.
-@PT