No, I didn't use "transcode now" first. I'll do that as soon as I get home this afternoon. As an aside, how much space on my computer will this take up? I only ask because the computer is basically full (nearly 500 GB) after editing the video.
The audio format is a mixture of things. There are probably 10 videos in the project, which were edited over the past several years using a variety of software. Some video files are mov, some are mp4. Even audio files within different projects differ, as they weren't captured in the same method. I know for sure that the following file types are included at some point, and there may be more: wav, mp3.
Thanks again.