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<p>In frequency modulation we modulate the frequency &mdash; "modulation" here is just a latinate word for 
"change".  Vibrato and glissando are frequency modulation.  John Chowning tells me that he 
stumbled on FM when he sped up vibrato to the point that it was creating audible sidebands 
(perceived as a timbral change) rather than faster warbling (perc