Red Witch Pentavocal Tremolo PedalA New Approach to Tremolo Red Witch pedals are brewed for the discriminating guitar player! The Red Witch Pentavocal Tremolo offers several features that are completely unique and unavailable elsewhere. Yes indeed, the Pentavocal Tremolo offers several features that are completely unique and unavailable elsewhere. Since the fifties the concept of tremolo has changed very little. Controls for Speed, Depth, Volume and Waveshape have been the parameters