I have just downloaded the ifyoucanqtmov.zip form
Looking at the file in MediaInfo
there is a 89 audio tracks in that file,
so could it be because of that that there is no audio playback?
This is what is says below the download text on the webiste:
"When the opening slide appears, wait about 20 seconds then press the spacebar to move from slide to slide. There is no sound on the first 5 slides.
On slide 6, you will hear a note played on piano - if not, adjust the volume on your computer.
If you have any problems with the file, make sure that the entire 451 MB file has downloaded."
In my Totem Media Player I have no Audio showing in the properties of the file.
In my VLC I can hear on slide 6 one piano tone and after that no more audio.
I would say that the file is not correctly recorded, the file has bean created using Apple Keynote 5.1, so I would not be surprised ..