The subreddit r/Cymatics was clearly set up for the real subject: its page title is still "Cymatics: Physical Manifestations of Sound". Read the feed and it is entirely Cymatics.fm customers. The newest posts are from April 2020 and include "I might have a small Cymatics addiction lol", "Does anyone have ONYX, CARBON or PLATINUM?" and several Spanish-language requests for sample packs. One user openly proposes that the subreddit be repurposed for trading paid sample packs generally.
Nothing since. It is not moderated into anything, it is simply abandoned in that state.
We log it because it is the top Reddit result for the word, and because the live community — r/Cymatic, no S, founded in 2026 — is easy to miss when this one is sitting above it. One letter separates a dead marketplace from a working forum.