Hello Rich,

It seems like, no matter how closely you try to mimic the waveform of a
real instrument,...


I have a feeling that this is exactly the problem. Engineers try to
mimic the output waveform instead of looking how the real instrument is
built. If they did that, they'd try to emulate all the individual parts
and pieces.

Regards, Joerg

http://www.analogconsultants.com