Klaus Schulze uses the Sequential Circuits Prophet 2000, as detailed on the "Klaus Schulze's Instruments" page.

Listed on the actual official Legowelt website as being a piece of gear used by him at some point. Can be found on the "Synthesizers" section.

"Martin uses an [E-mu] Emulator II and a PPG Wave 2.2. Andy has a [Sequential Circuits] Prophet 2000, and I have an Emulator II and a Korg DW-8000."

"The characteristic sound of the album is the orchestral string sample I got from Doctor Sounds in New York for my [Sequential] Prophet 2000."

From the FAQ Pages of The Enigma Archive: "From the credits of various albums, it is known that Michael Cretu uses or has used the Waveframe 1000, Audi Frame Workstation, MIDIMoog, PPG System, Korg M1, C-Lab Notator, Takamine 6 and 12 String, Tom Anderson Electric Guitars, Otari DTR-900, Akai 900, Linn 9000, Prophet 2002, X-Pander, EMS Vocoder, DX-7, and Roland Super Jupiter."

In the YouTube video "David Bryan Keyboard Lesson #1" by Petsitterincharlotte, David Bryan discusses using the Sequential Circuits Prophet 2000 during live performances.

"Q. I noticed that during your solo albums you moved through the gamut of classic 80s keyboards including the PPG Wave, Yamaha GS-1 and Roland D-50. What are your fave synths from the 80s?

I loved the GS-1. It was big and high quality but I don’t think I used it a lot on my solo albums. I think it was originally made for the small church market in America so that they could get the sounds they needed without buying a huge church organ. I had a deal with Yamaha who stuck with us over the years and when the GS-1 came out I ended up going to Hamburg and sitting with a Yamaha programmer who created some great string sounds for me. I loved playing that instrument and I could play the vibrato with my feet. I’d stand up and rock back back to keep the sustain going and do the vibrato with my foot.

I used the PPG a lot. I got into the Rack Mounted DX-7, the TX-816. I’d got into MIDI in the early days in my own studio for the first couple of solo albums, Transportation and Stand Up and Walk and linking all these things up to get new sounds. I had a Prophet T8, the Prophet Sampler, the Roland D-50. it was like Keyboard City. The Prophet VS was used a lot. I really liked the joystick and the way you could morph between sounds."

"Keyboard-wise, I've just got a Prophet 2000 sampler which is great fun. I've got a Roland Jupiter 6 and two Yamaha DX7s; an Oberheim OBXa synth which I'm just about to have adapted for MIDI so that I can sequence it from the QX1; and there's a beaten-up old Emulator 1 sampler, which I probably won't use any more now I've got the Prophet 2000."

In 1987, during the recording of the album "Blood Type," Georgi Guryanov and Yuri Kasparyan got Sergey Kuryokhin drunk and spent the following night recording synthesizer parts for the album using the Sequential Circuits Prophet 2000. This is detailed at the 18:12 timestamp in the YouTube video

"We rely pretty heavily on the Prophet 2000 sampler, although it was not my choice. It just happened to be what turned up in my studio. Everyone seems to say that the actual sound quality of the 2000 is very, very good, better than most, but I don't particularly like it. I got upset right away that you can only transpose it up a very short distance. I was using a Mirage before, which is supposedly a much less sophisticated thing, but you could transpose over five octaves. Other than that, I'll admit it's a pretty good sampler."

This photograph shows Sergey Kuryokhin playing a Sequential Circuits Prophet 2000. The front-panel layout and logo confirm that this is the Prophet 2000 sampling keyboard used by Kuryokhin during his experimental and Pop-Mechanika era.

Diagram of John Beck's keyboard rig printed in the November 1986 issue of International Musician.