I was trying to figure out hot to make this working, and the only solution (that I've not tested yet) is to use a time and reverb unit before the looper and not use the FX in the Catalyst. I'll try it with the new Valenton GP-5 (it's tiny) so I can use the amp sounds. Also, I'll try the time based and reverb FX in PRE position for clean tones, so I can take advantage of the Calalyst sounds. I know it is not the best solution, but I don't want to change my amd for a Katana or a Fender GTX.