The BD-2 Blues Driver is one of the earliest Keeley modified pedals. It is a wonderfully complex circuit that has many layers of tube amp simulation. Essentially being a Fender Super in a box, it captures dynamic and expressive and captures many tones that guitar players love.
Fast forward 16 years and Keeley re-introduced it as the Super Phat Mod and now added a germanium amplifier stage right after the tone stack to the circuit to simulate a tube power amp section.
The result is a more aggressively voiced overdrive with a spongy compression and fuzz that only germanium transistors give. The Germanium Super Phat Mod does not only have the perfect JFETS for tone, but also all the bluesy amp-like tones you crave.
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