Came across this from Sony:

SpectraLayers Pro Overview (http://www.sonycreativesoftware.com/spectralayerspro)

There's a demo and a video intro you can download.

This could be a great tool. Looks like a bit of a learning curve, but it could save your audio.
I didn't buy it because I don't need it right now.

Thanks for the link. Their examples sound good. I could think of quite a few uses but I would wonder if the fee could justify the extra effort. For $375 that's over the threshold for work I do.