I'm working with an audio aptitude null that was created from a soundtrack and wondering if there is a "quick" way to keep keyframes over say a value of 20? Or mark them somehow, need it more for a visual cue for myself, without having to go over each keyframe manually.
You mean delete any values created lower than 20? Open up the curve editor in value mode, try to find out where 20 is at and drag a rectangular selection to everything below it and delete. This would be the fastest way I know. But there are other ways to make something pop out in screen everytime it gets higher than 20 (via expressions).