Mike Beigel founded Mu-FX in 2013 in Encinitas, California. Mu-FX is dedicated to the modern all-analog refinement and re-issue of the classic Musitronics product line including the; Mu-Tron III, Octave Divider, Phaser, Bi-Phase and others.
The first Mu-FX product was introduced in 2013. Based on the original Mu-Tron III, the first and best envelope filter pedal ever, the newly developed Tru-Tron 3X retains all the "mojo" that made the original pedal so popular.
BSL Envelope Controlled Filter
Historical Profile (no longer produced)
Beigel Sound Lab was formed in 1971 and provided product prototypes of musical products. The first prototypes of a unique synthesizer and "Timbre Generation" filter bank were produced for Guild musical instruments by Mike Beigel and Isidor Straus. Then Mike Beigel set up Beigel Sound Lab to finish the production engineering and final prototypes. Shortly afterwards, Guild's president Al Dronge was killed in an airplane crash and Guild dropped the synthesizer project. We then produced a prototype envelope controlled filter from some components of the original Guild synthesizer, then formed Musitronics Corp and invented the Mu-Tron III and other products. In 1978 Musitronics was sold to ARP instruments and I re-started Beigel Sound Lab to provide musical product design services on a consulting basis.
A prominant musician had asked for a more sophisticated version of the Mu-Tron III, so I designed the rackmount Beigel Sound Lab Envelope Controlled Filter and had about 50 manufactured in 1980. Many prominant musicians including Elliott Randall, Marlo Henderson, Tim Bogert, Michael Iceberg, Jeff Baxtor, and Will Lee used them.
In 1996 I started working with Mike Matthews of Electro Harmonix and have devoted all my musical product work to Electro-Harmonix since then leading to the development of the Q-Tron. However, we still service Beigel Sound Lab and Mu-Tron vintage equipment, and have a few selected units for sale from our in-house collection.