EMS Synthi 100
The Synthi 100 was developed from a combination of three VCS-3 systems, ending up with 12 VCOs, two keyboards (each of it duophonic, making it possible to play four voices simultaneously), and a 3-track 256-step monophonic digital sequencer. Two 60 x 60 matrixes were used to connect the different modules by using patch pins. The keyboard spread could/had to be adjusted, making it difficult to play a tuned temperated scale for a longer time, but allow for alternative tunings easily.
The sound of the Synthi-100 was subtly distinct from the VCS-3. Both filters and oscillators were much more stable in the Synthi-100. The instrument, however, was very sensitive to temperature changes, so it required repeated re-tuning.
The Synthi 100 also had an add-on computer interface known as "Computer Synthi" which contained a PDP-8 minicomputer and 4Kb of random access memory. It featured an LED display, twin digital cassettes, Two 24 x 60 matrix patchboards, and a switch button control panel. Three were built.
Also the Vocoder 5000 (Studio Vocoder) was available as a separate module installed into the Synthi 100. It contained a 22 band filter, 22 x 22 matrix patchboard, mic/line inputs, two oscillators and noise sources, frequency shifter, pitch to voltage extractor, and a spectrum display driver.
The Synthi 100 owned by Jack Dangers can be heard being used extensively on electronica group Meat Beat Manifesto's album R.U.O.K.?. Many photos from that album's CD sleeve are close-up photos of the Synthi 100's control panels and displays. It was claimed that his unit was the only one still in working condition at that time.
A Synthi 100 (formally from Melodia Radio) is on display at the National Music Center in Alberta, Canada. Until recently The Music Department of the University of Saskatchewan, in Saskatoon, Canada, also possessed a Synthi 100. 
In 1970 the BBC's Radiophonic Workshop took delivery of an EMS Synthi 100 modular system. Their composer Malcolm Clarke was one of its most enthusiastic users. One of the more notable scores he produced with the Synthi 100 was the incidental music for the Doctor Who serial "The Sea Devils".
The first classical electronic music LP album generated exclusively on the Synthi 100 was released by Composers Recordings, Inc. in 1975. Called "American Contemporary-Electronic Music" (CRI SD 335), it featured full LP side lengths of music from Barton McLean (Spirals) and Priscilla McLean (Dance of Dawn).
The University of Osnabrück, Germany, has a Synthi 100 variant labelled "Synthi 200". The same variant was bought in 1973 by the Bulgarian National Radio for the electronic music studio of Simo Lazarov (the photo was taken about a decade later).
Eduard Artemyev, Yuri Bogdanov and Vladimir Martynov used the Synthi 100 owned by Soviet label "Melodia" for their record "Metamorphoses - Electronic interpretations of classic and modern musical works". Also Lithuanian composer Giedrius Kuprevičius for their rock-oratorio "Labour and Bread" (1978) and Estonian composer Sven Grünberg for the soundtrack of "Hukkunud Alpinisti hotell" (The Dead Mountaineer's Hotel) (1979) as mentioned in the title sequence of the movie.
- Synth Museum article
- Inventory of the University of Osnabrück with a Synthi 100 labelled "Synthi 200"
- Article on the restored 'Digitana' model at sonicstate.com
- Specifications booklet (9.20 MB PDF)
- The EMS SYNTHI BLOG
- "EMI Synthi Range 1969-1979". Retrieved 2011-07-26.
- "Jack Dangers: Master of Dub Electronica". Retrieved 2009-09-14.
- "The Story Of The BBC Radiophonic Workshop". Sound on Sound. April 2008. Retrieved 5 June 2012.
- "Electronic Music". Spirals, Dance of Dawn. New World Records.
- Karlheinz Stockhausen, "Sirius, Elektronische Musik und Trompete, Sopran, Baßklarinette, Baß (1975–77)", in his Texte zur Musik 4 (DuMont Dokumente), edited by Christoph von Blumröder, 301–29 (Cologne: DuMont Buchverlag, 1978): 311; Karlheinz Stockhausen, Stockhausen-Kurse Kürten 2000, Kompositions-Kurs über Sirius, elektronische Musik und Trompete, Sopran, Baßklarinette, Baß (1975–77) (Kürten: Stockhausen-Verlag, 2000): 12, 18.
- "synthfool". Retrieved 2009-09-14.
- Artemiev, Eduard; Bogdanov, Juri; Martynov, Vladimir (1980). Metamorphoses - Electronic interpretations of classic and modern musical works. Melodia.