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 available for adjustment. Till now. The Pentavocal Tremolo is simply that - a tremolo with five different voices to choose from. You can select the frequency response by turning the rotary selector to the desired setting. From a delicate shimmery flutter trem to a pulsy low end throb they're all there. The Pentavocal Tremolo can certainly also do the classic sound of a vintage valve trem and then soooo much more. It also has another completely unique feature - the bottom control.