I’m doing some routine podcast editing and production and I have a recurring problem when I mix old and new files. The intro, outro, and break work parts were recorded in a different session a while back. Any time I mix these evergreen work parts with the current content, the levels of those parts are coming out below the current content when I do the final mixdown. Take a look at this.
The levels are all consistent before I do the mixdown. I’ve tried using loudness matching and some mastering techniques to no avail.