I have a Bogner Shiva that I'm very happy with, but I really want to get a pedal to give it a volume boost in case I need it to cut through a little bit more than the standard boost channel live. I don't want a pedal that colors my tone in any way, shape or form. If a pedal "fattens" or "enhances" the signal, I'm not interested (the Shiva is a fat, compressed amp as it is, any "enhancing" pedal like that will turn the lead channel to mush IMO). I'm thinking of pulling the trigger on a Keeley Katana. Anybody have any advice for a true clean boost pedal?