I finally got around to trying out X2 and figured I would try something "simple" and realized I do not understand routing. I took a generic MIDI file and loaded it, then inserted the SI-Bass Guitar," and sent the output from the MIDI bass track to the input on the SI-Bass. The SI-Bass plays with a midi input keyboard fine (auto-echo active track), but the linkage this way makes no sound at all soloing the trrack(s) and starting the transport. Then I tried copying/pasting the midi clip into the SI-Bass track specifically, soloed that track, and again nothing. The Bass track is set to input M-Audio Ozone Omni, output to the SI-Bass. SI-Bass does not have an input other than a controller (which it will echo). I simply want to drive the SI-Bass from an existing MIDI track, but not sure what I am doing wrong. Also, this MIDI file does have 16 existing tracks, and I cannot find how to change MIDI channels within X2, so wonder if I made my own conflicting loop here. Also... as I was typing this message, I found my other issue... when activating different tracks, I no longer can hear the bass UNLESS I change the bass program (sound file). I have no clue why this happens... the only thing I have changed is active track a few times, and soloed/unsoloed things to check reaction.... then the auto-echo goes away unless the bass sound is changed.