Hmmmm. That looks familiar. Below is an extract from
www.pptfaq.com/FAQ00047.htm:
<quote>
a.. Right-click the sound's icon and pick Custom Animation from the popup
menu. The Custom Animation pane will open and your sound file should be
listed.
a.. Click the arrow directly to the right of the sound icon to pull down the
various options.
a.. Select Effect Options, and on the Effects tab, click the radio button
beside Stop Playing after XXX slides. Put 999 in the box so the track will
play throughout all your slides, even if you go back and forth among slides.
PPT
a.. considers each transition a "slide," so you want to put a large number
in there.
a.. Now check the settings in the Timing tab. To play automatically, the
timing should be set to Start After Previous with a 0-second delay.Click OK
to close the dialog box.
</quote>
And from the bottom of that very same page:
<quote>
Contents © 1995-2008 Stephen Rindsberg, Rindsberg Photography, Inc. and
members of the MS PowerPoint MVP team. You may link to this page but any
form of unauthorized reproduction of this page's contents is expressly
forbidden.
</quote>
In future, please link to the PPTFAQ or put solutions into your own words.
Steve may have more to say on this matter.
Lucy