s1    is a simple demo of the MusE software synthesizer interface.
      It has no gui and no parameters to set.

organ is a demo synthesizer which shows how to implement 
      polyphony and a gui

fluid is demo synthesizer utilizing the fluid sythesizer library

mus   is a program which can load any of the MusE synthsizer plugins
      turning them into standalone synthesizer with a JACK audio and
      midi interface