I finally found something I don't like about the KPA - the Treble Booster stomps don't work like "real" Treble Booster stomps... these appreciably boost the treble - which sounds like what they should do... but the sweet Germanium boosters actually helped an amp to distort more in the treble register than in the low-end - on an overdriven amp they don't sound like more treble, but like clearer and less muddy distortion.
Trying to conjure up a Brian May tone - an AC30 TopBoost with a treble booster in front just sounds harsh and piercingly biting.
Please consider making a "Germanium Treble Booster" stomp that actually increases the treble-end distortion / reduces the bass-end distortion and doesn't appreciably make the output tone stinging-bright.
Maybe you could do a "crossover distortion" or "band distortion" stomp -- the user could set an overdrive on the mid and a fuzz on the high end leaving a little plain amp overdrive for the low end. Bonus if you could add an attack-delay on these.