I gotta say that looping drives me nuts in 80% of shows where I see it. A live show should be about what the band can produce together on-stage in real-time. Having canned guitar parts is cheating -- if you need another guitar, get another guitarist. Or, figure out a way to play the song without the tapes. I remember a Stereophonics show a few years ago where almost all of the most interesting guitar parts, including some of the solos, were totally canned and the singer/guitarist was just playing strum rhythms. That's weak.