simple FM works when there is a relashionship between a carrier sound wave
and a modulation sound wave. what you hear is the carrier sound wave that is
being controlled, or modulated by the modulation sound wave. the idea is
that amplitude changes in the modulation sound wave alter the frequency of
the carrier wave thus when changing the value of amplitude in the modulation
wave you get frequesncy representation of that change in the carrier wave. on
the AN1x it is achieved by splicing vco 1 into 2 oscilators..master and slave.
i hope i'm making sence...
Eitan Teomi.
<A HREF="
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