TECH 21 OVERDRIVE + BOOST You want a Boost or Overdrive, but not flat out distortion, something that’s a little flexible too. Well, Tech 21 has your answer. This is similar to their Boost Distortion pedal, with up to 21 db of clean boost available at the stomp of a switch, but instead of the Distortion circuit, there’s an Overdrive. In terms of sound, think more of the superstars of the 70’s when tube amps were pushed to get a gritty sound without pedals. So you get some dirt, but nothing like quicksand. And the Boost circuit comes after the overdrive, acting as a pure, clean boost. The Tone circuit acts as a low pass filter that allows rolling off of the highs without a muddy sound. The Sparkle knob adds a dose of upper harmonics for a nice shimmer.