There are presets available but they are not very good. They demonstrate some of the features though.
If you can't/don't want to run the application, you can watch some lame videos instead:
Just click the right mouse button and select Presets/Music 1 in the popup menu. The node at the bottom is the result. Zoom with '+' and '-' and pan with the arrow buttons.
The node at the bottom is the result "score". Click on the node and then on the green "play" button to hear the music. It might take a few seconds before the music starts but any longer than that is a bug :(
This particular preset graph only creates simple arpeggiators and strums, but the beat generation is more interesting perhaps.
The nodes are unfortunately not documented, but you can just ask me if you run into trouble :)