Carl Martin is doing a groovy thing out there man.  Introducing the Vintage Flanger designed for those guitarists who desire this unique form of modulation.  The Vintage Flanger has four knobs to control Speed, Depth, Pre-delay and Feedback, plus a dual speed mode that is foot-switchable.  There are no rules with a Flanger, just plug this versatile modulation pedal in and play play play.  As with all the Vintage pedals, the Flanger comes in a solid, diecast housing with the cool CM graphics and chicken-head knobs.  It can be powered by 9v battery or a (recommended) regulated 9v power supply like the CM Big John.