Gusorgan is a DOS program for midi keyboard and the Gravis Ultrasound
adapter.  It mimics an organ console with one keyboard and 16 stop tabs.
Stop tabs select what voices (patches) will play when midi keys are pressed.
You use the computer keyboard to select the stop tabs.  A config file is used
to select what patches are control by the stop tabs.  Up to 16 patches can be
controlled and played simultaenously by Gusorgan.  If you do not have a midi
keyboard or midi adapter you can still hear the patches demoed using the demo
command.