DJ Vespers runs an Ableton Live training website, with lots of great videos on how to use Live and other music production techniques. Recently he asked me for some advice on how to properly prepare your tracks in Ableton Live to send to a mastering engineer. Here’s the video:
While you’re there, take a look at some of his other videos, lots of good information available for free.
One thing he didn’t have time to cover in the mastering prep video concerns sample rates. When you export your project, export it at the same sample rate you worked at. There’s usually very little to be gained by upsampling during the mixdown in Ableton Live, which only uses a so so sample rate coversion in order to be practical for live use. So if you’re writing your song at 44.1kHz, just export a 24 bit, 44.1kHz file to send to the mastering engineer.