Nigel,
Bitflipper says it's a waste of money since you can do the same thing with standard tools.
He did point me to similar a 32bit app called Space Boy by Elevayta. I've used it and it is quick and easy when all the instruments are on a bus and the vox are on a separate bus just setup a send an receive (one on each of the buses). Did the trick in less than 30 seconds of work.
I also bought Trackspacer (cuz it is 64bit) and it is similar in approach but I just have not had the time to try it out.