Certainly be something I would rule out as I'm not sure Premiere upsamples on the AAF export like it would do on a playout.

Are the mp3 files 44.1khz?

I've had issues like this before and usually media based. Only way I find to solve issues like this is trial and error, send in five min sections or one track at a time, see if anything works when isolated. Have you tried a new project with a simple AAF just a music file to rule out workflow issue.

I believe the only way to do this is via Fairlight automation tool which works at the track level. You should be able to then show the automation as keyframes and tweak them.

Hi, it's a single perpetual license purchase rather than a subscription. Currently only supports timeline markers and not bins. But I will look into the adding media pool clip markers feature into the next version.