MU-TRON III

Before the pedal went into production in 1972, it was called "Auto-Wah". The "Mu-Tron" name came about when one of the four founders of Musitronics suggested it as a good contraction of the company's name. The "III" was a favorite number of Mike Beigel, the company's Engineering V.P. There never was a Mu-Tron I or Mu-Tron II.