Thanks guys re the use of RT's. I've found that to get good transitions from one instrument to another in solos and then back to the vocalist it is necessary to not only regenerate tracks but often to cut and paste down to a quarter measure or so. Fills are easier as you can ease them in and out and the transitions sort of get lost in the mix. Given that Janice can typically nail the vocal in one take I'm left with a lot of time to experiment with the above! It's overwhelming what we can do now with a relatively simple DAW. I used to spend a LOT of time back in analogue days re-recording myself playing a simple bass or rhythm guitar track just to get one run the way I wanted it.