I THINK I've solved this problem. The culprit seems to be not
maintaining the same sample rate and encoder bitrate when
converting the audio file among formats. I started with AIFF files
with a sample rate of 48.000 kHz. I edited them as needed and then
resaved them (still as AIFF files) at a sample rate of 44.100 kHz.
I used Final Cut Pro to do this but any good audio editor will work
(WavePad is an inexpensive and really good choice on the Windows
platform). Then I normalized the audio files and applied noise
reduction using WavePad (basically applying some additional filters
to make the file sound better), then resaved the file as an MP3
file, with a Constant Bit Rate of 98 kbps (don't use Variable Bit
Rate ... Captivate can't handle it...this is one of things I've
found led to slowed down audio or audio being repeated). I also
used a setting that made the MP3 file Mono (my original files were
stereo but Captivate doesn't seem to like stereo). So now, after
importing the MP3 file into Captivate, don't use the Captivate
audio editor to lower the volume or edit the audio. This also
appears to cause audio problems when publishing. I do everything to
the audio file outside of Captivate first. Now, when you're ready
to publish, make sure your Captivate audio export is 98 kbps and
44.100 kHz (in other words that it matches exactly what your MP3
audio files are). So far, this has solved the problems of audio
slowing down or repeating one audio file on multiple slides.
I've also found that using WAV files in Captivate instead of
MP3 files causes major problems. I know this is weird because when
you import MP3 files into Captivate, they are converted to WAV
files then converted back to MP3 when published. Go figure.
It seems that no one at Adobe or any of the experts here on
this Forum have ever run into this issue, since no one had even a
suggestion for how to fix this. Odd. It happened everytime I used
the Publish feature in Captivate 2 and now 3. It took me hours of
trying variations of every possible encoder bit rate, file format,
and sample rate to finally find some that didn't cause problems for
Capitvate. The folks at Adobe need to spend some time in Captivate
4 making sure that the audio import and export functions are more
idiot proof and can handle files without problems occuring. Not
everyone is an audio wiz.
Jim