Aphex Twin ended up selling a CS-5 with the sleeve notes of Selected Ambient Works, Volume II written on the bottom of it.

Mentioned in this May 2018 Sound on Sound interview.

Born in Queens, New York in 1963 to Irish parents who returned to Dublin when he was 10, Kevin Shields first picked up a guitar in 1980 and began recording at home two years later, using a Yamaha CS-5 synth and Tascam 244 Portastudio.

“There were only a handful of them around in Ireland,” he says of the latter. “It ran at high speed and it had the two parametric EQs covering the whole frequency range, which was kind of something at the time. My approach was as much about using the tape machine and the synth as the guitar. Nothing was favoured at that point. I appeared to be a guitar player years later. But really, from the start, I was coming from a kind of post-punk-influenced era where it was quite normal for people to do anything. It was quite an experimental period. The idea that you couldn’t do anything didn’t occur to me.”

Mentioned by producer Daniel Miller in this May 1982 Electronics & Music Maker interview. Gore specified it to be his first synthesizer at Moogfest 2019, as recalled in this April 30, 2019 Parklife DC article.

Electronics & Music Maker, May 1982

How long have the band been playing synthesisers?

"About 18 months now. When they started they always used a drum machine and they were playing more conventional instruments. Andy (Fletcher) was playing bass guitar and Vince was playing electric guitar. Only Martin had a synth but when the others saw the possibilities it offered they both got one as well. Then they started to like bands like Human League and Kraftwerk so they gradually changed their instrumentation."

What equipment did they originally have?

"Martin had a Yamaha CS5, Vince had a Kawai 100F and Andy had a Moog Prodigy."

Parklife DC, April 30, 2019, "Interview: Martin Gore of Depeche Mode (In Conversation with Daniel Miller of Mute Records @ Moogfest 2019 — 4/26/19)"

As Martin recalled during the conversation on April 26, he fell in love with music when he was 10 years old and listened to his mother’s rock and roll records over and over. Soon after hearing Kraftwerk, Martin expanded his interests to electronic music, purchasing copies of Autobahn and Trans-Europe Express.

Martin began playing guitar in a band called Norman and the Worms when he was 13 and then formed another called Composition of Sound with his future bandmates in Depeche Mode, Andrew Fletcher and Vince Clarke. Another friend, Rob Marlow, lent Martin a Korg 700S, and Martin later purchased a Yamaha CS5, his first synthesizer.

if you pause at 1:21-1:26 I believe you can see the Yamaha cs-5

When releasing their highly acclaimed album, 'A Deeper Understanding', Adam decided to put what synths were used on each track in the Liner Notes and Credits of 'A Deeper Understanding'. In his interview with Boston Globe (https://www.bostonglobe.com/arts/music/2017/09/20/war-drugs-adam-granduciel-sweats-every-detail-pursuit-perfection/Ul3jUYasSWOoblcy8D790K/story.html) Adam said 'I could easily just say synths. But even if I play a little bit of the song on this one synth, it's probably a specific part or something, so I want them to be like, 'Oh what's a Yamaha CS-5? Oh that's cool.' From this we can see Adam used the Yamaha CS-5 on 'A Deeper Understanding' and we can gather from the liner notes of the album (as seen above + highlighted) that the CS-5 was used on the song 'Up All Night'

Used extensively in the early years on pretty much everything from the Telekon album up to The Fury.

Featured in the Gear List on Richard Barbieri's website.

In the YouTube video titled "Siouxsie and the Banshees - Redlight," Steven Severin is shown using the Yamaha CS-5 Analog Synthesizer.

In this picture of the band's live setup, The Seven Fields of Aphelion is seen playing on a CS-5 at Blender Bar - Ritz, SXSW 07

Dave Ball played a Yamaha CS-5 on the Grid album "Electric Head," according to the liner notes.

can be seen in this post from April 16, 2020

Item can be seen 1:26 into this video.