Here is an amazing film from 1975 (I think), featuring an EMS Synthi 100
"An electronic music composer working late one night is considered obsolete by the Synthi100 electronic music synthesizer"
ENJOY 😉 😋
UPDATE:
I got in touch with Tom Popielski (the actor / film maker) and he said this: "I made this film back in 1975 while a student at Indiana University studying electronic music and working for a multi media production company. Only two 16mm prints were made, one I donated to the local public library and the other I hung on to. This Synthi 100 was originally purchased by Indiana University then sold when the electronic music professor along with a few others started a multi media production company named i.e.inc. in South Bend, Indiana. As a student I started working for the company which produced multi projector slide shows with original music which was popular during that time. After several years he and the original partners left the company to pursue other interests. I stayed on for a while but with all of the creative talent gone it was time for me to move on. The company was then run by the only remaining partner who was a writer with not much business sense and shortly after that went out of business. The building where the company and studio were located has since been torn down. I don't know where any of the equipment including the Synthi 100 ended up as I had left the area"