The Seafoam Plus Chorus will forever change the way you think about chorus. Keeley has developed a new type of chorus that, until now, has only been available in expensive DAWs and in studios. Not only is it tuned for guitar, but there are voices and modes created specifically for bass players including flanging and tremolo. Lastly, this tri-mode chorus pedal offers internal switching for vintage and modern tones, further doubling the amount of sounds you can get. In the Seafoam Plus Chorus you get the automatic doubler that Keeley developed in the revolutionary 30ms Double Tracker. The ADT chorus is what Keeley calls True Chorus, because it creates a second and third voice, similar to singers in a choir. Not only do they sing at different times, they sing at different pitches.