Collaboration -Sharing & Exchanging Digital Audio Data :
For a number of years now The swift rise of wider bandwidth and cheaper storage have made it possible for musicians to collaborate online. For example: I have recently been working on a project that involves musicians from 3 separate and geographically remote locations.The scenario of one musician tracking the basics of a song then uploading and sharing it with another fellow musician becomes very easy.It would be a good idea to decide on one of the collaborators as a technical supervisor - he will be the person who will be in charge of all the technical issues of the project and will co ordinate all the relevant files and necessary data for the later mixing stage. From my experience there a few traps that should be avoided by sticking to the next points.

Midifile / Tempo & Meter Map - all collaborators must share the same metronome data ie using the same General Midi file or tempo map.

Sync point / Time Stamp - All audio files should be sharing the same original time stamp starting from the absolute beginning of the session.making sure your session starts at 00:00:00 and paying. Additionally its recommended that you place a region containing a 2 bar count off that wold serve as a “slate” at the top of each and every track in order to eliminate any doubt regarding sync issues.

Resolution - Its Important to decide ahead and agree between all collaborators on the digital audio file format sample rate and bit depth and making sure they are followed throughout the entire project.

Tuning - From my experience its crucial to agree upon the absolute tuning reference of your instruments before starting a collaboration So whether you want to use the standard 440 or any of the alternate 442 make sure all of your fellow collaborators are aware and agree upon the tuning.