Thanks - I have to confess that it's not my idea - I saw it here:
http://www.lbthosting.com/dutton/others/ReWire.pdf
And like all good ideas, I immediately nicked it.
I've updated the blog page with some better video, which now has 100% extra added sound.
It's also on You-boob as well:
http://uk.youtube.com/watch?v=9qNBE9O_Emw