What effect is this?

[dougiefresh1891]

Anybody know what Jimmy Herring is using here or what Jerry uses in the original?


http://www.youtube.com/watch?v=P8UGkOn9vNY&feature=related

 

[Fender074]

Some kind of swell Filter?

 

[Non-Digital Tom]

Mu-Tron III, both Jimmy and Jerry.

 

[Non-Digital Tom]

Jerry was known for using the original Mu-Tron III and it more or less became his signature sound. Many other envelope filter effects have come out since then, but I happen to know Jimmy Herring uses an original Mu-Tron III because he bought it from me.