^^^Second this. The suggestion to open all four files and then copy and paste them all together would take alot more time than open append...plus you might accidently not grab the whole file to copy and paste. It's already been suggested a couple of times already, but the function to use is 'Open Append' and it exists on both Audition 1.0 and Audition 3.0. It's right beneath the 'open' and 'close' functions in the first pull down menu in Audition. I've never run into any file size limitations in Audition, which includes a continuously recorded Panic 3hour long show in 24bit (no setbreaks), which ended up in 24 bit being someone on the order of close to 3gb at 24/48.