A new feature in Logic Pro 7.1 is Elastic Audio, which enables your recorded tracks to follow any tempo changes you make after you've recorded them. However, the progress bar that displays when Logic loads Elastic Audio tracks into RAM may stop progressing if there isn't enough RAM to load the files.
If this happens, abort the process by pressing Command-period (.).
So how much audio can you load into RAM at any given time? This will depend on the following:
You can do a number of things to use the RAM on your system more efficiently: