Questions about the automatic slideshow maker in Vista Photo Galle

Marvelous tool, just push F11 or the knob at the bottom of the window and
with with a beamer you can produce a spendid slideshow on the wall or a huge
screen! Much appreciated also are de different modes of operation, however I
have 3 little problems:
1) is it possible to add background music
2) what is the use of the last item in the options menu (it is called
"dempen" in dutch, so maybe "attenuate" in english)
3) I would like to SAVE such a slideshow, but I see no way to do it. Also
tried to CAPTURE it from the screen (using SnagIt, Camtasia, Media Encoder 9,
....) but no result: you can see all the preparations to get it started and
once it does you only get a black screen !!!
Anyone who has the answer to these questions ???