Remembering Mike Beigel: Mu-Tron Inventor & Audio Pioneer
Mike Beigel, inventor of the revolutionary Mu-Tron envelope filter, passes away. His legacy shaped funk, rock, and fusion forever.
The music world is mourning the loss of a true visionary. Electro-Harmonix recently shared the sad news of Mike Beigel's passing, an immensely talented engineer, inventor, and pioneer whose revolutionary creations permanently altered the landscape of electric guitar and keyboard effects.
Mike Beigel & Musitronics
Founded in 1972 in Rosemont, New Jersey, Musitronics Corp.—co-created by Beigel—ushered in an entirely new era of sound.
Before Beigel introduced the world to the Mu-Tron III, musicians relied heavily on mechanical wah pedals that required a physical rocking foot motion to shape frequencies. Beigel changed everything by inventing the world’s first envelope-controlled filter.
Rather than requiring a treadle, the Mu-Tron III responded dynamically to the player's picking envelope, opening and closing filters with lightning-fast speed and precision.
Funk Royalty and Defining Soundscapes
Though Mike Beigel famously remarked that he “didn’t really get what was going on in the music scene then,” his stompboxes became the beating heart of funk, rock, and fusion.
Players like Bootsy Collins plugged their "Space Bass" straight into a Mu-Tron to forge the definitive Parliament-Funkadelic groove. In 1973, Stevie Wonder famously ran his Clavinet through a Mu-Tron III to craft the unmistakable, bubbling cadence of his landmark hit “Higher Ground.”
From Jerry Garcia and Frank Zappa to Joe Zawinul, Larry Coryell, and Chick Corea, legends across genres swore by Beigel’s creations.
A Legacy of Patents and Groundbreaking Gear
Beigel’s technical genius extended far beyond a single pedal. Holding around 45 U.S. patents, his engineering footprint includes legendary units like the Mu-Tron Octave Divider, Phasor, Flanger, Vol-Wah Pedal, and the monumental Bi-Phase. His collaborative spirit also brought other iconic circuits to life, such as the Green Ringer for Dan Armstrong Amplifiers and the innovative Gizmo (Gizmotron).
When Musitronics was sold to ARP Synthesizers in 1979 and subsequently folded, Beigel's journey in audio innovation didn't stop. In the mid-1990s, at the request of Electro-Harmonix founder Mike Mathews, Beigel helped reinvent that classic sound, leading to the EHX Q-Tron—a pedal that carries his sonic legacy forward to this day.
Decades later, under his Mu-FX banner, he released the Tru-Tron 3X, a modern tribute loaded with original circuitry mojo, high-gain options, and expanded controls.
Reflecting on his profound impact, Electro-Harmonix shared:
"We are all saddened to hear the news of Mike Beigel, an immensely talented engineer and inventor. EHX engineers were fortunate to work with Mike on several important products, including the Q-Tron. He was a true pioneer who contributed to music some of its most iconic effects influencing and inspiring musicians and builders for decades."
Rest in peace, Mike Beigel. Inventor, musical electronics pioneer, genius, and a founding father of Musitronics Mu-Tron. His contributions have inspired so many artists to create music that makes the world “more better”.
What was Mike Beigel's most important invention?
The Mu-Tron III, the world's first envelope-controlled filter pedal, invented in 1972. Unlike mechanical wah pedals, it responded dynamically to the player's picking envelope, changing how musicians shaped sound across funk, rock, and fusion.
How many patents did Mike Beigel hold?
Beigel held approximately 45 U.S. patents. His innovations included the Octave Divider, Phasor, Flanger, Vol-Wah Pedal, Bi-Phase, and the Green Ringer for Dan Armstrong Amplifiers.
Which famous musicians used Mu-Tron pedals?
Stevie Wonder used the Mu-Tron III on 'Higher Ground,' Bootsy Collins defined Parliament-Funkadelic's signature sound with it, and legends including Jerry Garcia, Frank Zappa, Joe Zawinul, Larry Coryell, and Chick Corea relied on Beigel's creations.
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