Hi all, Just curious... what are the differences between the Xotic RC and AC boosters? For that matter, the BB preamp as well? I'm looking for a booster pedal, and I saw a video of Scott Henderson playing some of the Xotic pedals. Got me interested, but the info on the website doesn't really go into much detail about what the pedals do... and they all have the same controls! So what are the differences between them? Anyone know? Thanks!