Ugh. Not sure. Then again I just spent my first full day with my Helix LT running 4CM through my Mesa Express and it sounds glorious once I figured out how to do that effectively. I put together four presets that handle most of our playlist including some very song-specific effects and I'm blown away at the quality of the sound through that amp. This thing is some serious gear but I truly love my Mesa. Probably my Fender amp is headed out the door tho, along with a good number of pedals, which will be hard. That said, I may feel different next week.