Hi Don,
Does setting the bypass mode to DSP+FX bypass work for you? With DSP+FX when you bypass the effect (via the footswitch, H9 Control, MIDI, etc), the trails (reverb, delay,etc) play out.
Also, I know for sure that DualVerb has a post mixer b/t the verbs, so you set one verb to dry and use the FXMIX parameter as a MIX knob b/t your dry and wet signal. Other effects may have a similar functionality built in, but I don't recall off the top of my head.
