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If you’ve been enjoying [Elliot Williams’] posts about filters, you’ll see there is a lot of difference between active audio filters and passive RF filters, although some of the ideas are ...

The tech essentially takes a 5.1, 7.1 or Dolby Atmos signal, and applies a series of audio filters and EQs to those different channels, making it sound like those audio tracks are placed around you.

Synths such as the Prophet 5, Fairlight CMI, and Korg Mono/Poly relied on voltage controlled filter ICs — the SSM2044 — that you can’t buy new anymore. If you can source a used one ...