Hello Spehro,
Whatever it is, if it has to come out of speakers it isn't going to
sound quite right.
In case of a Hammond organ it might since it has a speaker. Of course,
it's a tube amp but that is a whole other matter which alone could make
this thread balloon.
It'll take a lot of gyrators and filters but considering that one can
buy a 400MHz DSP for less than a crate of beer these days it should be
feasible. In case of our piano the DSP still couldn't win. The piano
doesn't need power. Not even light since it has its own candles.
Regards, Joerg
http://www.analogconsultants.com