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The squad is complete :^) You can find the equation for the triangle wave here: https://en.wikipedia.org/wiki/Triangle_wave We're using this one: |x mod 4 - 2| - 1 Modifications have been made to correct the frequency and phase: |(4x + 1) mod 4 - 2| - 1 The white noise is generated by calling rand() and dividing it by RAND_MAX to get a value from 0 to 1. Then it's adjusted to fit between -1 and 1.