Going by my most iconic posts (which is my measure of quality)
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Buad’s thread - already mentioned but it will always be no.1
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Lend us your ears was a wild ride
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Music memes contains a lot of laughs
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The bi-weekly sampling extravaganza threads are always friendly and stuffed full of talent, a great place to hone your OT skills, link to the current challenge
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The Eurorack gear I’m currently trying to shift (buy my stuff!)