Zatchary, i actually just brought this up yesterday….
As CharlieX2 said, Soundtrack Pro can do it…. tho i find it inefficient and honestly produces poor results.
I too came from the Avid world originally, and this lacking feature is ridiculous.
I once looked into purchasing Digidesign’s plugin, but unfortunately it wont work with FCP (i even looked into methods of converting it into an FCP compatible format). This ability needs to work in conjunction directly in your FCP timeline to be of any practical use. I do hope that with enough complaints and encouragement from working professionals, Apple will come to their senses and add this plugin as built in internal standard,… or co-develop with a third party so that we can purchase this plugin, since it is very worth it.
ive also tried a little app called “Amazing Slow Downer” which works “ok”… but again it works outside of FCP, and the sound quality is a bit poor….
if you can get away with using either of these for your offline rough cut (if applicable), and can afford a proper final mix, finishing (and recreating these) in protools is one way to go.