i really hate using percentages, for one thing it's not very descriptive. 50% of 6 is not the same as 50% of 12 for example. it's fine if you're working on the entire file at once, but when you're working on 2 or more files or parts of a file, it just doesn't make sense. i mean if i want to boost or lower a section 3db, i don't want to try to figure out what the % is.
hopefully someone else will speak up that uses cep with an answer. i'm almost tempted to hunt down a copy just to figure this out.