I have a comp with many layers. At the beginning of each layer, I want to play an AIFF file (the same one for every layer).
Rather than adding the AIFF asset to the project over and over, is there a way to add the sound file to the comp once, and then add an expression to each layer to play that sound at the layer's in point?
Pre-render the piece, add the sound in Audition, Premiere or Soundbooth, then render the final. I advise against using time-remapping with audio. There will always be skewed audio frames, regardless how careful you set it up. AE is simply not cut out to be an audio tool.