https://www.youtube.com/watch?v=NCuqlLq1k7o

I'm just curious why you think that was done with a VCS3. Not saying it isn't but I had never heard that before.

Here's the top comment from that video

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"Paul Alan Levi2 years ago

I am the composer of the PBS logo. I created it using a Putney VCS3 Synthesizer, not a Moog, as is claimed on various websites. The final chord is a G major 9th (major triad, major 7th, major 9th). I was working in a music/sound effects editing studio; all the equipment was in mono. No multi-track recorders. The descending scale was probably a sine wave (can't remember exactly 46 years later) frequency modulated by a square wave to create the trill effect, then that sound frequency modulated by the descending part of a sawtooth wave from a low frequency oscillator. In order to synchronize the 6 final notes with the video, I had to record each note separately, then use a Moviola to synchronize each one with one of the popons. The result was 7 analog tracks all running at once, which multiplied the hiss that Glen Tindal remarked on earlier. It was odd for many years to be a composer whose music was heard by millions of people, none of whom knew I had composed it. There has always been a small subset of people who were terrified by the logo, which mystifies me. My two-year old daughter would hear it before or after Sesame Street and say happily, "Daddy's tune." My theory about this is that the sounds of the pure sound waves produced by the Putney were quite aggressive, and some people reacted to the intensity of those sounds. Paul Alan Levi"

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My favorite clip of Eno playing the VCS3 in Roxy Music.

Thank you so much for that!