I thought this project might be interesting to you guys:
Sononym - Machine-Learning Powered Sample Browser
Short introduction video on youtube
http://nav.440network.com/out.php?mmsc=forums&url=https://www.youtube.com/watch?v=VfKin1n_YaA
"Serious about using samples for music production or sound design"
It does 100% automatic tagging/categorization of your sounds, and works completely offline too.
It can even find samples from a recording that you've just made (using sound to find sound - a.k.a. similarity search).
Works with OS X 10.9 or newer, free trial available from the website:
http://nav.440network.com/out.php?mmsc=forums&url=https://www.sononym.net/
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