"Most" boosts need two knobs max. I would group them into three categories (which is probably going to get me in a lot of trouble.). These are generalizations and do not cover all of the hundreds of boost pedals out there.
Clean boost, adds no color - SD Pickup booster, EHX LPB-1
Boost adds color dynamics - Rangemaster, Bohiemium Boost, Xotic EP Boost,
Boosts one frequency or range - Systech Harmonic Energizer, Triskelion, MOOG Drive
Clean boost, adds no color - SD Pickup booster, EHX LPB-1
Boost adds color dynamics - Rangemaster, Bohiemium Boost, Xotic EP Boost,
Boosts one frequency or range - Systech Harmonic Energizer, Triskelion, MOOG Drive
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