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by neckro23 434 days ago
If you mix a square wave of one duty cycle with another of a different duty cycle, they partially cancel each other out and you get a new sound.

I'm not sure, but I believe the original NES Castlevania does this in some places, like in the "you died" jingle. (It's possible I'm misremembering and it's simply two square notes separated by an octave.)