MXR M-101 Phase 90

The MXR Phase 90 was a phaser pedal used by both Sting and Andy Summers.

Sting's MXR Phase 90
Sting had the MXR Phase 90 for phasing effects on his bass, which he used a lot with The Police. He used it from Spring 1979 during the Outlandos D'Amour tour until the Synchronicity tour in 1983. Sting owned two MXR Phase 90 pedals, which together onstage for a time on the Reggatta De Blanc tour but later reverted to just one. He once remarked that the MXR Phase 90 sounded much better on the fretless bass than the Cry Baby he once had, as there was no "fret rattling" noises.

The MXR Phase 90 can be clearly heard on Sting's Ibanez 8-string bass in footage of himself and Stewart improvising on "Canary In A Coalmine" featured in the Around The World film.

Andy Summers' MXR Phase 90
In the early days of The Police, Andy had a Fender Twin Reverb amp and an MXR Phase 90. Andy Summers eventually had the Phase 90 embedded in his Pete Cornish custom FX board, as well as at least two extra ones.