OK... here's my current setup. I have a Hartke HA3500 head with a 4x10 and a 1x15. The Hartke has a preamp on it and I had issues using my DI (preamping a preamp and such) but wanted to get the tone shaping of the M80 on stage soooo.... I ended up looping into the MXR using the effects send/return. All works fine. Now... I am looking to downsize (just size ) my rig for ease of setup and breakdown as well as fitting all my crap in my car. I'm in a Rush tribute band so I have 2 keyboards and footpedals also. My question (finally, right?) is... with no effects loop on the MB212-II, has anyone ever run this amp with a preamp DI box like the MXR M80? Any issues with it? My plan is to take the pedal to my local music store and test drive it but wondering if anyone already knows. Thanks!