Sporting the same gain knob interface and circuitry for up to a 26dB boost with the addition of a two-band EQ to finely mold and shape the boost, the MXR Micro Amp + marries MXR's reliability with a keen eye for detail. Designed in MXR's Custom Shop and part of a re-release of some of their most iconic pedals, this effect is built to last the years, whether on the road or in your basement. The Micro Amp + was first produced by the MXR Custom Shop as the CSP233, but later became a standard production model, the M233.