Hi - I have been using B-3X with my Genos; at one point, I had Genos' MIDI connected by USB to an iPad through a "Camera connection kit" (really just a USB to Lightning adapter). I took the audio from the iPad's headphone out and ran it directly into the Genos AUX ins. It worked fine! I have since migrated to having my 2nd keyboard contoller, an M-Audio Code49, be the one I use to play B-3X. I still run the audio direct to AUX of the Genos.
Jim