The Valco company of Chicago made amplifiers under their own name in addition to building amps for other companies such as Supro®, National, and Gretsch, to name a few. Most of these were lower powered amps with a great sounding natural tube breakup and many models also featured a unique sounding tube driven tremolo. It had a hypnotic throb and was also capable of hard, choppy tremolo. Combined with the breakup overdriven characteristics of the amplifier, it created a percussive, rhythmic pulse that is very inspiring to play. The Catalinbread Valcoder was designed to recreate the tube tremolo as well as the amplifier breakup of these vintage amplifiers in a pedal. Separate input and output controls allow you to get anything from a clean tremolo sound all the way up to a gritty tube like breakup driving the tremolo circuit.