The Moog Moogerfooger MF-108M Cluster Flux is marketed primarily as a tool for delay-based audio effects.
But, as this demo by Moot Booxlé shows, the Cluster Flux is fully MIDI-controllable, and can be used as an analog synthesizer, in its own right. No other sound source or processing (besides some reverb) was used in this piece.
Here’s his full review of the Cluster Flux:
im curious to know what they meant by driving it into self oscillation, how would you do that?
There’s a feedback knob that provides both positive and negative feedback. Feedback is essentially uncontrolled oscillation.