Often refered to as the worlds best envelope filter. This one doesn’t have the orange faceplate (I bought this one specifically because I thought it looked better.) Sounds fantastic and has original box, manual etc. Offers Considered.

From the hotrox website:

EMMA DiscomBOBulator envelope filter

Is what is commonly referred to as an “auto-wah” or envelope filter. This pedal was designed to react precisely to even the fastest of playing, while still being able to deal with strong signals such as chords. 

In addition, the Discumbobulator will retain the full spectrum of tone present in the original signal without the volume peaks and dips commonly to other filters. Its multiple controls (Sensitivity, Up/ Down, Width and Attack) allow precise adjustment to the responsiveness and degree of the effect, while its proprietary circuitry allows the Discumbobulator to be used for guitar, bass, or keyboards with equal effectiveness and dead-on tracking.