The Uni-Vibe (or UniVibe), also known as Jax Vibra-Chorus,[1] is a footpedal-operated phaser or phase shifter for creating chorus and vibrato simulations for electric organ or guitar. Designed by audio engineer Fumio Mieda,[2] it was introduced in the 1960s by Japanese company Shin-ei, and then released in North America by Univox in 1968.[1]

It was intended to emulate the "Doppler sound" of a Leslie speaker. Though not very successful as a Leslie simulator, the Uni-Vibe became an effect in its own right, putting its stamp on tracks like Robin Trower's "Bridge of Sighs", Jimi Hendrix's "Machine Gun" and Pink Floyd's "Breathe".

Shin-ei Uni-Vibe (1968), Jimi Hendrix, EMP Museum
Shin-ei Uni-Vibe (c.1968)
once owned by Jimi Hendrix
(exhibited at Experience Music Project)


The effect, though often associated with chorus, is in fact created through a staggered series of phasing filters, unlike the usually aligned filters of a normal phasing effect. Unlike most other phaser pedals, this is achieved without the use of op-amps.

The Uni-Vibe phase shifter was known for its throbbing, hypnotic pulse and lo-fi sweep. These unique effects set it apart from other modulation-type effects at the time.[1]

Expo Pink Floyd - gilmour effects rack
rack mount modified Uni-Vibe (right mid) on David Gilmour's effects rack.
(exhibited at Expo Pink Floyd)

The Shin-ei Uni-Vibe was also sold as a Univox product.

"Uni-Vibe" is now a registered trademark of Dunlop Manufacturing, Inc..

Notable users of the Uni-Vibe are Jimi Hendrix, Robin Trower, Trey Anastasio and David Gilmour of Pink Floyd.[3]


  1. ^ a b c Harry Shapiro, Michael Heatley, Roger Mayer, Jimi Hendrix Gear, page 120, Voyageur Press
  2. ^ Molenda, Mike; Pau, Les (2007). The Guitar Player Book: 40 Years of Interviews, Gear, and Lessons from the World's Most Celebrated Guitar Magazine. Hal Leonard. p. 222.
  3. ^ Tolinski, Brad. "Welcome to the Machines". Guitar World (September 1994). Archived from the original on 2012-05-24. Retrieved 2011-07-29.

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