Hey bro, congrats I just got my Kemper! Thing rocks!! Page 80 in the Deeper reference manual explains this....as you might already know. Looks like we are going to have to use up one of our effects modules in order to use external effects in the effects loop. I needed stereo capabilities, therefore I/we have to assign either the "X" module or the "Mod" module for running external effects into the loop in stereo. The other effects modules can be assigned to the effects loop, they just cannot be run in stereo. The are mono only.
Marcus