MXR CSP038 Brown Acid Fuzz Effect Pedal Review (October 2023)


Last updated on September 28, 2023 1:58 pm Details


In this review post, we’re going to be discussing the MXR CSP038 Brown Acid Fuzz Effect Pedal, including an overview of its unique features.

Product Description

The MXR Brown Acid Fuzz delivers psychedelic silicon saturation to guitar and bass players who like it low, slow, and heavy. Based on a classic 1970s UK fuzz circuit, this pedal’s simple three-knob interface allows you to plug in and tune out in no time at all.

Dial in the Output, Tone, and Fuzz controls to set the mood, and then let the heaviness flow forth as the world around you melts into a fuzzy, synesthetic convergence of colors and sounds. Whether you want to ride droning power chord currents across the universe or summon burly grooves at an ancient altar, this pedal has all you need for your musical invocations.

A limited-edition offering, the MXR Brown Acid Fuzz comes adorned with the arcane renderings of legendary Bay Area artist Alan Forbes.

Product Features

  • Limited Edition
  • Ideal for guitar and bass
  • Streamlined 3-knob interface
  • Tone, Output, and Fuzz controls
  • Adorned with custom Alan Forbes artwork
  • Delivers classic psychedelic silicon saturation

Pros & Cons


  • Strong build quality
  • Very reputable
  • Positive consumer reviews
  • Worth the price
  • Excellent sound output
  • Portable


  • Rather pricey

MXR CSP038 Brown Acid Fuzz Effect Pedal Demo

Our Verdict

The Brown Acid Fuzz comes in a brown regular-sized MXR metal container with a trippy graphic by San Francisco-based artist Alan Forbes, who has worked with QOTSA and The Black Crowes. The pedal is voiced for bass and guitar, and it riffs on old-school British fuzz tones in the style of the Colorsound Supa Tonebender Fuzz, which riffs on the tones of early ’70s EHX “Ram’s Head” Big Muff stompboxes.

Indeed, wherever you end up on the evolutionary path to Brown Acid Fuzz, there will be riffing. Consider how Buzz Osborne of the Melvins employs a Boss ODB-3 Bass Overdrive in his pedalboard, and this Brown Acid Fuzz makes complete sense to musicians who turn up and tune down in search of massive riffs.

With just 500 of the Brown Acid Fuzz being produced, you’d better act fast if you want one. The price is $219.99, so it’s only available from a few dealers.

Where to Buy

The best place to buy this product has to be Amazon, due to their competitive pricing and fantastic customer service.

MXR CSP038 Brown Acid Fuzz Effect Pedal

as of August 30, 2023 9:41 am

Pricing History

Price History for MXR CSP038 Brown Acid Fuzz Effect Pedal


Current Price $219.99 August 30, 2023
Highest Price $219.99 April 16, 2023
Lowest Price $219.99 April 16, 2023
Since April 16, 2023

Last price changes

$219.99 April 16, 2023

Last updated on August 30, 2023 9:41 am

Buyers Guides This Product Is Featured In

Best Fuzz Pedals

Additional information

Item Weight

10.5 ounces

Package Dimensions

5.55 x 4.41 x 2.64 inches

Item model number


Date First Available

September 25, 2019


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