The JHS Warble Tron is a uni-vibe inspired pedal with a cut switch between Chorus and Vibrato modes. In addition to depth and volume controls, the speed parameter is connected to its own LED that indicates where the speed of the vibrato is set at any given time. The warble produced by this effect is closely associated with the guitarists of the late '60s including one Mr. Hendrix who used a similar effect on his recording of the Star Spangled Banner.