[jbasil]

How much do you end up needing to slip them? Also are they spot on at the session start and then drift, getting further away down the session?

Seems not right, like something's different in the two session settings. While PT's clock isn't definitive when set to internal, I often get and send files and they fit right in. Tell us more. : )

If you are using a session set at 100 bpm starting at 00:00 and he is also, you shouldn't have any problem. What happens if you "spot" a file to it's "original" time stamp? Does it go somewhere clearly wrong?