I've always loved the way Frank Zappa used the Dan Armstrong Green Ringer on his guitar solos, It had a unique quality to it, the way the effect seemed to morph in and out of the note being played, it would squeeze all these cool octaves and overtones out of each note.. I've never, ever tried a ring modulator, although I know the basic sound it has.. Is there anything similar to that original circuit available? ...preferably in a nice,reliable,modern package? my other question, is there a ring mod. effect that allows those overtones to auto-modulate? I would prefer not to use an expression pedal to control the parameters, if the effect could be set to slowly sweep through the spectrum by itself, that'd be cool..