raycastile wrote: [...] It sounds like it is clearly a monophonic synth. [...]
I would have thought you can play a CS80 monophonically quite as well. Just because it's eight-voice polyphonic doesn't mean you have to make use of all of them all the time.
I think it does, because you can hear the notes cutting each other off. In the entire piece, is there one moment where you hear two notes overlapping, even for a split second? Even though it's a slow piece, he plays some pretty fast phrases, lots of notes in quick succession, and you can hear the clickety sound of each new note cutting off the last one, as you would expect on a mono synth. I hear the same thing on some of his harmonica sounds on other albums.