What a great idea. Each little pedal is a DIGITAL preamp, modeled after a famous amp. They have 10 different versions. They sound pretty good to my ear. The only criticism I have heard is from "That Pedal Show", they demo'd a few and the guys complained that the output wasn't very high when compared to other pedal-style preamps. Demo starts at the 4:10 mark Demo at 25:32. This whole video is great.... love these guys.