Roger Waters

In Pink Floyd's 23-minute long song Echoes, Roger Waters used a Binson Echorec to create the eerie underwater wind noise heard during the first interlude (10:40-15:02 on studio recordings, underneath the screaming seagull sound produced by Gilmour); he vibrated the strings of his bass guitar with a steel slide and fed the sound through the Echorec. Waters reproduced this sound during live performances.

Also One of These Days is an another typical example where the Binson Echorec was used on the bass. In the interview for Guitar World, Gilmour explains: "One of these Days evolved from some of my experiments with the Binson, as did Echoes. One day, Roger decided to take some of the techniques that I was developing and try them out himself on bass. And he came up with that basic riff that we all worked on and turned into One of these Days. The opening section is me and Roger. For some reason, we decided to do a double track of the bass. You can actually hear it if you listen in stereo. The first bass is me. A bar later, Roger joins in on the other side of the stereo picture. We didn't have a spare set of strings for the spare bass guitar, so the second bass is very dull sounding. We sent a roadie out to buy some strings, but he wandered off to see his girlfriend instead."

The Binson Echorec was a major part of the Pink Floyd sound-image until 1977.

In 1977, Roger Waters, along with the band, transitioned from using Binson Echorec 2 units to MXR M-113 Digital Delay devices. These rackmount digital delays typically featured a 320 ms delay chip, with an expansion model offering up to 1.28 seconds of delay. While specific details about Waters' setup aren't mentioned, it's noted that David Gilmour's rig included two MXR Digital Delay units and two upgraded MXR Digital Delay System II units, highlighting the band's integration of advanced delay effects during that period. This information is sourced from Watersish.com.

In this photo of Roger Waters' rig, from this Premier Guitar article, his two Samson UR-5D Dual UHF Diversity Receivers can be seen.

TC Electronic D-Two Multi-Tap Rhythm Delay is based on the TC 2290. The D-Two can provide up to 10 seconds of delay, features 24-bit A/D-D/A conversion and 24-bit internal processing, comes with 50 factory presets and 100 user, and provides S/PDIF digital I/O at 44.1kHz and 48kHz. 6 unique direct-access features include Spatial (provides extra-wide delay at a single keystroke), Ping-Pong (pick any 5 patterns and set the relationship between panning speed and delay tempo), Reverse (reverse delay with the flick of a key), Dynamic (sets the release time and threshold to let the input signal control level of delay), Chorus (hit a single key to instantly add chorus or flange to your delay), and Filter (increases filtering as repeats decay). With the D-Two you are able to tap actual rhythm patterns consisting of up to 10 taps directly into the unit.

On the below picture you can see the rack of delays as used on The Wall tour in 2012. The rack includes Samson PowerBrite PB10 power conditioner and Korg DTR-2000 tuner.

As seen in this YouTube video: https://www.youtube.com/watch?v=9lCFaSL9aSE