Yeah, I always forget about the LS-2, great box ! Though again, boosting up doesn't really work on the SV. But you could devise lots of strategies to use the LS-2 to great effect for going from rhythm to lead. Another good option would be a volume pedal in the loop, bringing volume down for rhythm. I personally don't really like them, as IME it's kinda hard to get precisely to one point of the range, but some like them.