I coded up some thing to try to evolve expressions that match an input sound.

For one test input, code that makes silence gets a score of 46.9 (lower is better), and after about 6000 generations the score is around half that, but it gets stuck in a local optimum and doesn't improve after that. Trying to fix that.

My code is non-deterministic at the moment because it uses `rand()` in multiple threads. Need to fix that for reproducibility too.

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unfortunately it doesn't sound as good as I had hoped...

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