David Gilmour used the MXR M-151 Delay System II in his 1994 Pink Floyd stage rig, as detailed on the Petecornish website.

The MXR can be seen in this picture taken from Steve Vai’s website. The photo's description reads: "Steve with Pia in Stucco Blue Studios (June 1983)." The attached photo’s url is under Steve Vai’s website. (https://www.vai.com/wp-content/uploads/2021/04/june1983.jpg)

The webpage where the photo and it’s description can be found is here: https://www.vai.com/rare-photos/

BRIAN MAY's 1982 SYSTEM

The second stage system that I designed and built for Brian May during the Queen years was, from the Guitar:

Pete Cornish Line Driver (on Guitar strap): 100ft special cable with power for Line Driver Pete Cornish Treble Boost Pete Cornish Treble Boost #2 with bypass switch Foxx Phaser with bypass switch Pete Cornish Line Driver and Hum Loop Buster to Clean Amps (3 X AC30 - Normal Channel) Foxx output also to MXR DDL II (#1) then 3 X Delay #1 Amps via Line Driver and Hum Loop Buster Foxx also to MXR DDL II (#2) then 3 X Delay #2 Amps via Line Driver and Hum Loop Buster Foxx also to Roland CE-1 (seriously modified by Pete Cornish) then 3X Chorus Amps.

The above all built in two units - a pedalboard on stage and a large rack unit off stage (behind the AC30s) as was pictured in the August 1986 copy of Guitarist (USA) - check it out.

N.B. Brian May always used the volume control on his guitar to reduce the drive into the Treble Boost for quiet numbers and the second Treble Boost was used for solo boosts. Oh - and the “Cry Baby” in his pedal board is the “Foxx Phaser” speed control. The other pedal is for controlling the Eventide Harmoniser (part of the P.A.) for certain solos.

German Blues and Rock musician Marc Dorendorf uses the MXR Digital Delay Systeme II as his prime delay effect as part of the Pete Cornish designed guitar effects rack system.