n (amplitude distribution as opposed to frequency) of the modulating noise, centered around the carrier. 
The bandwidth of the result is about 4 times the peak deviation (the 
random number frequency times its index &mdash; is this just Mr Carson again?):
</p>


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<pre class="indented">
(with-sound ()
  (let ((gen (make-oscil 5000))
	(noise (make-rand 1000 :envelope '(-1 1 0 0 1 1))) ; "eared"
	(index (hz-&gt;radians 1000))) ; index=1.0 so bandwith=4 Khz (2 Khz on 