Hi, I have a video that was created in Adobe Premiere Pro CS3, it has 2 audio layers and renders fine. It works in any format but when I encode it with Flash (Be it the flash encoder, uploading to youtube, or using a third party flash encoder) my second layer of audio is completely blank.
Here's a thought... maybe the flv encoder can only recognize one layer of audio. Maybe try in PPro or whatever you're using to combine all of those layers to a master layer.. or when you render select video track one and the master layer to render. However, I don't see why this shouldn't be working when you render out of PPro.