I made a really huge beginners mistake in FCP 7 and dropped an mp3 into the timeline before my video. So after editing an entire 6 minute project, when time came to export the video file is extremely small and low quality. Is there a way to switch the video to HD without having to edit the thing all over again?
All is not lost. The trick is (I've done it many a time), create the new AIFF file. Delete the original MP3 from the drive. (This is while FCP is closed) then reopen FCP, then when FCP asked where the file is, uncheck the exact media box and point FCP to your AIFF file. Done.