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Devac · 1398 days ago · link · · parent · post: I'm putting together a Youtube Series on how to make your own synths using the free cross-platform software, "Helm", you should check it out!
Here's Wolfram Alpha. {n, 1, 5, 2} in Sum means "sum over n from 1 to 5, incrementing n by 2". You can plug pretty much any functions and values. WA is pretty limited but you can still have fun with it. Plot[Sum[Sin[n*x]/n, {n, 1, 5, 2}], {x, 0, 2Pi}]