
It comes with a tune (over one minute long), basically an MP3 converted to a .wav. That explains the humongous file size, the model itself is only a few polygons.
It is easy to add other tunes, I have a set of five or six, but they are all 1 to 2 Mbytes big, even after compression. If you like it, let me know and I'll upload them as expansion packs. It is simple to make the organ play a random pick from the play list.
fG