
<p>A different approach, also using a form of amplitude modulation, is mentioned by Moorer in "Signal Processing Aspects of Computer Music":
</p>

<img class="indented" src="pix/fmeq44.png" alt="jam case">

<p>This is the rxyk!cos generator in generators.scm.  It produces beautiful single-sided spectra.  We might grumble
that the sideband amplitudes don't leave us much room for maneuver, but the factorial in the denominator overwhelms
any exponential in the numerator, so we can get many interesting effects