an use more than one sinusoidal component in our carrier, or multiple banks of carriers and 
modulators, and depend upon vibrato and "spectral fusion" to make the result sound like one voice.  
In this cross between additive synthesis (the multiple carriers) and FM (the formant centered on 
each carrier), we get around many of the limitations of the Bessel functions.  There are numerous 
examples in fmviolin.clm.  One of the raspier 
versions of the fm-violin used a sawtooth wave as the carrier, and some sc