During Vai's time in Alcatrazz, he used a Bi-Phase as part of his offstage effects rack.

Trent Reznor's use of the Mu-Tron Bi-Phase pedal is confirmed by the Fragility Tour program, which lists it among the equipment used during the recording of "The Fragile." This information is sourced from nin.wiki, which provides a detailed account of the gear used for this project.

At 1:39 in this video taken from documentary about making of Siamese Dream, Butch Vig (album producer) says: "This is one of the secrets to our seret sound - this is the MuTron Bi-Phase. We run everything through it, everything... it's fabulous". (In the same video Vig calls Gish "sad" and Siamese Dream "happy, with a lot of happy songs", so I don't know how much can we trust him about anything else in the video)

Prince used a Mutron Bi-Phase on the Prince tour, and the For You and Prince albums.

On the chair in front of Josh Klinghoffer, in this photo, a Mu-Tron Bi-Phase pedal can be seen.

Dweezil Zappa explain fathers Rig https://youtu.be/jRXnPcIK1V8

According to the Sonic Youth Website, Lee Ranaldo used the Mu-Tron Bi-Phase during 1998 and 1999.

Full article here

Adam Hann of The 1975 discusses the use of a Mu-Tron Bi-Phase phaser pedal in creating layered, organic sounds. Although he does not own the pedal himself, it is utilized by producer Mike Crossey. The Mu-Tron Bi-Phase is noted for its classic status and high demand. This information is detailed in Premier Guitar's article, "The 1975: Adam Hann’s Sonic Obsession."

Used by Head on "Porno Creep".

Garcia’s Bi-Phase, preserved by Grateful Dead and Jerry Garcia Band roadie Steve Parish, was sold on October 14, 2021 as Lot #98 of Sotheby’s “From the Vault: Property from the Grateful Dead and Friends” auction. The listing quotes Parish saying that Garcia used the Bi-Phase for a couple of Jerry Garcia Band shows in the early 70s, while the listing itself claims that the Bi-Phase was used in the studio for drums.

Property of Steve Parish

Mu-Tron

Bi-Phase pedal, ca. 1970s

Effects board (4 x 13.75 x 10.25’’) with panels 2 phasor panels, 2 sweep generator panels, A and B inputs. [With]: Foot pedal (1.5 x 5 x 3.5’’) with 2 switches.

One of the rarest and most unique of 70’s effects pedals

“The Mu-Tron Bi-Phase consists of two independent 6-stage phasor circuits, two sweep generators (oscillators), and a number of unique additional controls to allow maximum flexibility in generating a variety of phasing effects. The Mu-Tron Bi-Phase also offers several convenience features including LED indicators on each phasor, mike stand socket on bottom of housing for above-the-floor mounting, and AC cord storage on back panel. The unit is furnished with a dual foot switch and has an optical photoelectric foot pedal and provision for synthesizer interface for external control of sweep. And, like all Mu-Tron products, the Mu-Tron Bi-Phase and its accessories are solidly constructed to withstand the most severe professional use” (from an original Bi-Phase advertisement, ca. 1970s).

Throughout the 1970s, Mu-Tron products were of the highest quality and innovative in their designs. Jerry had them in his racks and they became a part of his signature sound on songs such as “Fire on the Mountain” and “Estimated Profit.” The Bi-Phase was also of great use in the recording studio for a “Dub” effect on drums.

“Big” Steve Parish: “Jerry loved his Mu-Tron pedals. We bought this one together and he tried it in a couple of shows with the JGB in the early ‘70s. He eventually replaced it with the Mu-Tron Octave Divider.”

"One of my newest acquisitions…which we still haven’t put on a record. It shouldn't be too long."

Kraftwerk has utilized the Mu-Tron Bi-Phase, as documented in the Kraftwerk FAQ.