Here's a recent interview with Peter Zinovieff (who designed the VCS-3). His history with electronic music reveals the VCS-3's "modular" roots as a wall of oscillators and such.
Fascinating video.....interesting how younger musicians today and I say younger compared to Peter Zinovieff and Subotnik who totally embrace the computer and Daw, whereas these younger musicians, myself included tend to treat the computer and Daw as a multi track tape machine and performances are live with little post manipulation. Many would prefer to record direct to tape if those machines were more readily available and some people still do.
A lot to think about!