GENPO is the GENeral Purpose Organ. It is a program which replicates the essential features of any pipe, theatre, or reed organ.

GENPO reads a description of an organ (a .org XML file) and presents a suitable user interface for operating that organ. There are a number of high quality organ SoundFonts freely available and the .org file maps the stop sounds to organ manuals and stops. Other facilities such and couplers and presets are available. You may connect one or more MIDI keyboards to GENPO to provide the organ manuals, you can even assign one to be the 'pedalboard' if so desired!