What I suggest is that your friend renders each track to audio, but then sends you a copy of the SEQ file. You can then just open the file with all the tracks in place and at the right tempo. The mix will be preserved and provided you're both have access to the same plugins, the effects will be preserved as well.

As rharv says, if the wav files don't start at the very beginning of a bar you've got a problem, but this method solves it. It's the way we do it and we've never had any problems. Even a large SEQ file only takes about ten minutes to download and it's easier than loading the tracks individually.

ROG.