MXR Custom Shop Micro Amp+The MXR Custom Shop has combined the Micro Amp's famed boosting and tone sweetening capabilities with a specially tuned EQ section and low noise op amps to create the Micro Amp+. With its Gain knob, the Micro Amp+ allows you to dial up just as much gain as the original up to +26dB but with added EQ controls , you can now finely sculpt your boosted signal. The Micro Amp+ also features true bypass. Up to +26dB clean boost Low noise circuitry True bypass