hmm I have the ME 70 and you can't really get Alexi's sound with the distortion and pre amp selections on the pedal.
The most decent distortion on the ME 70 is the Mesa Boogie Dual Rectifier model.
With the gain turned all the way up, bass at 10 o'clock, Mids at 2 o'clock, and treble at 12 o'clock i can get a really good Jeff Loomis/John Petrucci type sound.