Jari's fourth volume was recorded in November 2002. It's actually the first CD we made for him - volumes 1 to 3 were on cassette tape. I hope to redo them on CD sometime...
You can listen to a sample from it streamed from this page. Our server streams RealAudio not mp3, so if you've not already got it you might need to install RealPlayer - download it here - you only need the basic free one which last time I looked was on the right of the page.