The second example of what might be made using the Malhaus Construction Kit. This is the version I personally like the best. It's short and to the point, but it says everything the project needs to say really. The walkthrough document (available from The Internet Archive page) is very rudimentary but might serve as a starting-point for your own "open source audio" projects.
ONLINE COMPLETE AT ARCHIVE.ORG - download for free in MP3 format.
The CD is £5 anywhere in the world. Total time: 9m45s