Allows user to use their computer to generate interactive, visual music that runs 'perpetually'. Sounder can run in the background, thus forming a kind of musical 'lava lamp'. Keyboard magazine said: "Hypnotic - I was instantly transported!"

Sounder uses the MIDI synthesizer portion of your sound card to generate its music. As a result, it does not take up massive amounts of hard disk space to store its music. You can play a piece for 10 hours using a Sounder file that is only 800 bytes in size!