What Haworth Guitars say:
The EHX Tube Zipper Envelope Filter and Distortion Pedal is an awesome Guitar Effects Pedal by Electro Harmonix.
At Haworth Guitars we love this Electro-Harmonix Tube Zipper Pedal's warm overdrive tone coming from twin 12ax7 tubes plus an incredible moving filter adding a wide range of unique envelope filter tones to complete this tasty little number.
What Electro-Harmonix say:
Unzip your soul! Just picture your guitar signal being massaged by a complex set of filters moving through a vacuum tube maze. Energized by two Electro-Harmonix 12AX7 tubes, the Tube Zipper's patented moving filter tastefully adds controlled analog harmonics to your signal. In typical EHX fashion, each control can be set over-the-edge, generating a host of novel tones. Tron or Trill a la mode!
"It's the most flexible little box yet." -- Adrian Belew