Wikipedia has a writeup on Mu-Tron: Mu-Tron Wikipedia The Mu-Tron III by Musitronics Corp. Since 1996 the Q-Tron developed by Electro Harmonix has been the successor to the legacy which is the Mu-Tron.
In early 1995 Mike Beigel was commissioned by Mike Mathews (owner of EHX) to reinvent the sound of Mu-Tron, today EHX still sells that sound as the Q-Tron.
Their best-known product was the Mu-tron III envelope filter, "the world's first envelope-controlled filter", first made in 1972 and quickly becoming an essential effect for many funk musicians.
The Mu-Tron III is an envelope filter made by Musitronics Corporation.
"The world's first envelope-controlled filter" was first made in 1972 by Mike Beigel and quickly became an essential effect for many funk musicians.
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Currently available in the USA direct only from Mu-FX for 9.73 at EU sales are handled exclusively by ATME (Analog Technology Music Electronics) foreign dealers/distributors are invited to inquire.