Catalinbread have a real handle on the boost concept. The Super Chili Picoso is the most beautiful and perfect stomp box I've ever encountered for clean-boosting 2203 type circuits. The one I have is quite old, probably a first run They make a great treble booster too, the Naga Viper. Perfectl going into a VM 2466. I also use the Maxon OD808 and OD9 quite often, mostly for recording solos and other parts that need that velvety mid boost. Volume cranked, drive at "0" OFA Dark Horse klon-style OD makes a great boost for my 1987X Pandora modded beast. This amp doesn't need any help at all, but the pedal adds a little different character to the harmonics which is very sweet and pleasing. I've got several other overdrives that I use as clean or semi-clean boosts too. My name is Trelwheen Kerosene Jickateen, and I'm a boost addict.