Thanks for replying @Tekalight.
Yes, the normalising thing, the penny dropped for me a little while after posting.
Kirk, if you're reading, this was such a helpful course for a newbie like myself. I have adopted your mixdown techniques and it's been a great help, I really like the end results and it was also an excellent starting point for much more research. And I was just in time to snag the API collection from Waves in Black Friday sale, perfect!