Hi Kevin, there is sound on the video tutorials here:
http://moi3d.com/2.0/docs/moi_help.htm

but it turns out that I used a sound codec (Windows Media _voice_ codec) that many Mac WMV players do not support.

But if you download the .wmv file, and then play it with the Windows Media Player from within Parallels, I think that should give you audio.

- Michael