"Do you remember the first synthesizer you ever owned?"

"Yes! An EMS VCS3."

Used on "In the Light" and "No Quarter", as stated respectively in the December 1977 issue of Contemporary Keyboard and in this July 9, 2014 Keyboard article.

Contemporary Keyboard, December 1977

I did use an old EMS VCS3 synthesizer on Physical Graffiti for "In The Light". It wasn't sophisticated enough to really sound like a synthesizer and you really had to be on the ball because it was murder to keep in tune. It did have a little joystick arrangement that could be used to control the pitch, though, so you could slide things; it was very manageable. But it couldn't go on the road. I had too much trouble with the mellotron in those days to take anything else out. Robert Plant was always saying "We've got to do "In The Light" onstage, " and I said, "No way, or I have to contend with synthesizers as well."

Keyboard, July 9, 2014, "5 Ways To Play Like John Paul Jones"

Ex. 2 is in the style of Jones’ intro to the song “No Quarter.” On record, Jones ran a Hohner Electra Piano (not to be confused with the RMI keyboard of the same name) through an EMS VCS3 synth and modulated the filter with a sine wave LFO. The result is a unique and psychedelic sound that works perfectly for the song.

David Bowie's Heroes in the composition used an EMS VCS3

According to thewho.net, this synthesizer was used on "Won't Get Fooled Again", and it was called "The Putney".

In this interview with Chris Everard from the October 1984 issue of Electronic Soundmaker & Computer Music magazine, Eno is asked, "I seem to remember seeing an old film of you with Roxy, I think it was The Old Grey Whistle Test or something similar, and you were playing what seemed to be an ARP2600, is that right?"

He replies, "No, I tell you what that was, it was essentially an EMS VCS3 synthesiser built into a unit that I designed. With Roxy you see, a lot of the time I was taking live instruments and feeding them into the synthesiser and treating them, so what I had was the basic synthesiser with some extra bits to help me... they are quite rough though, those early synths."

In a feature on Kreativ Sound, Tom Rowlands of The Chemical Brothers discusses their use of the EMS VCS 3 synthesizer in their quest to create a unique sound, distinct from the prevalent maximal electronic music.

In the video "Jean Michel Jarre - Oxygene Live In Your Living Room," Jean Michel Jarre is seen using a couple of EMS VCS 3 synthesizers throughout the performance. He mentions employing them for various sound effects, including wind and drone bleeps.

In the video of Native Instruments, Nils Frahm explains the background of the Piano sample library. You can see the EMS VCS 3 in the Saal 3 (close to the wall). While talking about his old equipment collection, you can clearly see the EMS VCS 3 at 1:41 Min.

In an article by Fika, it is noted that Richard Wright used the EMS VCS 3, a synthesizer known for its Synthi AKS model, which includes a keyboard and sequencer compartment.

Mike Dean playing around with the VCS 3 and other synthesizers. Possibly teasing a remix of the song Starry Eyes by The Weeknd.

EMS VCS 3 can be seen during Alessandro Cortini's "synth cave" tour. The item can be seen 15:31 into this video.

"The VCS is very cool to record straight, straight from the speakers."

In this video at 1:50, Paul Hartnoll show the oldest gear in the Orbital studio used for recording the album "Monster exist". FACTmagazine, Dec 2018.