I've got a pair of vortexes that I haven't fully explored but I wanted to point out Andy Butler's excellent Vortex Database. He's got samples and 'recipes' and lots of info on what a Vortex can do.
It can be found at
www.andybutler.com . Scroll way down the page for the link.
Thanks to the previous poster for reminding me of how cool these units are...well described too!