Rsotstick, it seems you’re correct. Even the diagram of the Hardware in Racks shows that the “effects” (not including reverb) which is the compressor, eq and guitar emulators, go to the mixer slider. But the reverb never goes to the mixer slider, for some dumb reason they decided to route around it so it could not be included in the mix. The only send that works for me for rev-x (hardware) is to use the UR824 BUS FX L/R. If I use mix1-4 I get no reverb.