As noted in the original KEGS 0.91 documentation by Kent Dickey, the Ensoniq 5503DOC emulation can be inaccurate at times. Symptoms include notes sounding out of tune/off key during music playback (particularly in DivisiTune and MIDISynth music), and some sound effects cutting out or not playing as they do on a real Apple IIgs. (common with SoundSmith music)