Anyone using the AFX with a pedal synth like the Roland GR-20/33 or something similar? How do you have it routed? I've got one on the way and started contemplating the set up. Can I just run it in front of the Axe and use the pickup selector to toggle back and forth between the guitar and the synth as needed. If it's that simple what kind of patch would sound best for the synth? Tube pre or just some sort of "blank" patch? Thanks in advance for any suggestions.