Thank you Matt. Follow up questions: If I receive an mp3 - when I open it in RB it decompresses the file. So if I then send a wav back in return it should line up with their original wav if they didn't shorten it for the mp3?

A while back when I sang a little part mid song for Russ he had me record a few seconds of silence at the beginning and then something about clicking on "consolidate" - honestly I can't remember the exact procedure - is that necessary in RB? Because the last track I sent I just selected (highlighted) the whole track and exported it to a wav.

So far with wavs or mp3s, this lining things up is frustrating. I do make an mp3 of my mix and the timing is on the money......

Would putting a couple of bars intro of drum beats for a count in or something help whether or not the receiving daw has a time stamp capability?

Thanks again.