Losing sound on loadmovie of On2 video

I have an SWF that I created with flash8.
It was originally in flash MX, so when I published it I used the actionscript 1.0 option.

I used On2 to create a flash video in flash8 swf format converted from an AVI.

That On2 flash video plays with sound.

When I use loadmovie to load it into the main flash movie described above it plays without sound.

Any ideas?