.5 100 0.01265)) ; .0005 0.1 100
the sum has DC! and the difference is a pulse train, but higher srate fixes that

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<div class="greenish">FM and noise: sin(sin(rand))</div>

<p>
One way to make noise 
(deliberately) with FM is to increase the index until massive aliasing is taking place. 
A more controllable approach is to use a random number generator as our modulator.
In this case, the power spectral density of the output has the same form 
as the value distribution functio