@spec noise(seed()) :: {float(), seed()}

One sample of white noise, from -1.0 to 1.0, and the seed for the next. The same seed always gives the same sequence.

@spec sample(shape(), float()) :: float()

One sample of shape at phase, with no band limiting.

phase is a position in the cycle from 0.0 to 1.0. The result runs -1.0 to 1.0.

@spec sample(shape(), float(), float()) :: float()

One sample of shape at phase, band limited for a phase step of step per sample.

step is freq / rate. A step of 0.0 gives the raw shape. :sine and :triangle ignore step.

@spec seed(term()) :: seed()

A seed for noise/1, from any term.