you can use dropbox or email to send the mp3. Tim can send you a file in any form you wish, mp3. wave. aiff. etc. Alternatively you can send stems or MULTIWAV files.
So, you've recorded your track and you need some blazing Hammond B3 organ to bring it to life. No problem Just send Tim an mp3 and Ihe will add some magic to the track.
You have a choice of:
Fender rhodes, wurlitzer, Acoustic piano and of course, Hammond B3.