This video is primaril
Format: 4K + SOUND, narrated, annotated, duration 24 mins.
The main Audulus synth patch sound exploration starts at 12:30 after some narrated theory and analysis in Wolfram Mathematica (which is worth listening to if you wish to know exactly what the patch does and does not do).
Shepard-Risset continuous "ever rising" tones in the Audulus node-based digital modular synth/
Format: 4K + SOUND, duration 14 mins. The main synth sound exploration starts at 01:00.
Has up to four "octave" oscillators per Risset tone generator group, and two Risset tone generator groups can be combined with a phase shift to make even more interesting sounds. This video only shows the top-level control patch and explores sounds under the various controls and settings (the sub-patch machinery is not shown here).