Jeskola Buzz has a pretty interesting back story:

>The development of the core program, buzz.exe, was halted on October 5, 2000, when the developer lost the source code to the program. It was announced in June 2008 that development would begin again, eventually regaining much of the functionality.

The plugin in that demo isn't by Jeskola, it's by HD (Haldreamer) who I believe is a Russian audio developer who made some nice Buzz plugins in the early 2000's. Source: I have it installed and I just checked the "about" box.

This brings back memories. Buzz is how I got my start. And I've been producing electronic music as a hobbyist ever since.