Very interesting and might come in handy.
However there is sometimes no getting away from doing it from scratch.
eg. I'm working on a song in which I would like to have a 4 part string section playing. However as most of the verse is just sitting on a D chord with the vocal line doing the work, the method described in the video may need a bit of tweaking.
DOH!
But I'll use it at some point.
Thanks Tone