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The MXR M133 Micro Amp is an effects box that lets you boost your signal using a single control knob.
This tried-and-tested classic can be used in a number of interesting ways to add gain and volume to your playing.
You can boost your signal for leads, use it to tweak your signal for two different guitars with unmatched output, for example a Strat and a Les Paul, or use it for a constant boost for smaller amps aswell as in a long effects chain where signal drop causes problems.
You can also use it effectively on valve amps by plugging in to the effects loop for a very loud clean boost, or use it to push the front end harder for more volume and drive.
As with all MXR pedals, this simple unit is housed in a bullet-proof casing and features an excellent quality switch.