Volume levels vary between files. No apparent reason

[edm6740923]

I made two Audition files, one on one day and one on the next. My setup was the same (same mic, same distance from input (e.g. guitar). But the second file is much louder than the first. I had the same volume settings. Any control I may have changed inadvertently?

Second question: how do I create equal volume levels between several files? I