Doing the clip renders is a good idea. Try rendering one in poser using the full frame bryce render WITHOUT the audio track imbedded, and then add the audiotrack in after the render. and if video wave can hadle it, you might want to try converting the .wav file to .mp3. (download.com has converters. I'm not sure if they have any free ones, but there would at least be one you could try for free)