Released in 1975

MXR Auto Phaser

The MXR Auto Phaser is a professional phasing unit with low distortion, minimal noise, and a wide range of effects. It features easy operation, low power consumption, and a broad supply range, making it suitable for studio, portable mixing, and PA applications. Unlike flanging, its phase-shift response creates non-harmonic notches in the audio spectrum.

Released in 1975

MXR Auto Flanger

The MXR Auto Flanger is a professional audio delay line designed for true flanging in both portable and custom setups. Its versatile controls ensure ease of use, while its precise time delay creates a musical tonality in percussion, distinguishing it from phasing.

Released in 1976

MXR Model 129 Pitch Transposer

The MXR Model 129 Pitch Transposer is a classic piece of audio equipment that was released in the late 1970s. The unit was designed to allow musicians and audio engineers to transpose the pitch of audio signals up or down by a fixed amount, ranging from one octave below to one octave above the original pitch.

Released in 1976

MXR Model 113 Digital Delay

The MXR Model 113 Digital Delay is a self-contained audio delay line which utilises sophisticated technology to achieve a new standard of professional quality. The culmination of an intensive design program, the MXR Model 113 Digital Delay is unparalleled in versatility, ease of operation, and creative application.

Released in 1976

MXR Model 126 Flanger/Doubler

For more than 30 years now, both engineers and musicians have relied upon the MXR Model 126 Flanger/Doubler as one of best-sounding bucket-brigade* flanging effects ever made. Through its signature flanging, doubling, and delay effects, the MXR Model 126 Flanger/Doubler imprints a very unique sonic signature on guitars, bass, keys, drums, or just about any source needing depth and movement.

Released in 1978

MXR Thirty-One Band EQ Graphic Equaliser

The MXR Thirty-One Band EQ is a professional-grade graphic EQ introduced in the late 1970s, offering precise tonal control for studio, live sound, and broadcast applications. With 31 frequency bands spaced one-third of an octave apart and a ±12 dB adjustment range, it allows for detailed sound shaping, feedback reduction, and room correction. Its rugged 19-inch rackmount design, high-quality faders, and connectivity options – including 6.35 mm jacks and XLRs – ensure durability and compatibility.

Released in 1978

MXR Dual Fifteen Band EQ Graphic Equaliser

The MXR Dual Fifteen Band EQ offered precise two-channel frequency control with bands set two-thirds of an octave apart for greater accuracy, particularly in the midrange. Each channel had its own level control, with a ±12dB range per band, housed in a rugged 19-inch rackmount design with quarter-inch connections.

Released in 1981

MXR Delay System II Digital Delay

The MXR Delay System II is a high-quality digital delay unit offering up to 800 milliseconds of delay with a 16 kHz bandwidth. Designed for studio and live use, it provides effects like flanging, chorus, echo, and doubling with clean, noise-free performance. Featuring a four-digit display, LED indicators, and XLR and ¼-inch connectors, it ensures easy integration and precise control.

Released in 1985

MXR 01A Digital Reverb

In 1985 it would seem MXR employed the team at ART (Applied Research & Technology) to produce a digital reverb, based on the ART 01A, and it even had ART listed as the manufacturer on the front panel.