Video by Stagecraft Software via YouTube
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The RingMod (ring modulator) is the little understood secret weapon of synth enthusiasts and dark hip-hop and dub producers everywhere. This effect has been used in the design on many, many synthesizers, particularly the early modular synths (Moogs, Oberheims, etc). Notably, it was also used as the voice of the Daleks (in Dr Who).
Check it out here:
https://www.stagecraftsoftware.com/products/ringmod/