Visit http://www.sourceaudio.net/ for more info - Jeffrey McAlack of Source Audio demos the many tones and features available in this funky and versatile envelope filter pedal. The Soundblox Guitar Envelope Filter holds 21 different filter types and can also be controlled with Source Audio's patented Hot Hand Motion Controller Ring. Hear the riffs of Nile Rodgers, Bob Marley and the Clash through this amazing effects pedal.