I made a video in Vegas 3LE, rendered it to a Windows Media 8 file (highest settings). I then relized I wanted to add more audio, so I rendered the just the audio to a MP3, made a new VEG file and plopped in the MP3 and rendered video (with audio). I want to sync up the audio from the MP3 with the audio from the WMV file, but when I play the project in the preview window, I only get about .01 FPS, if that. The origional project plays fine (varies between 10-30 FPS in preview window). What could be causing my slow playback? The video as a Wnidows Media file, or the MP3 audio? I've used MP3's before and had no problem at all. Thanks!
ps: I had to do render the audio and re-import it because LE only supports 4 audio tracks, and i needed more.