Narration audio cuts out at the end of each slide

I'm using Articulate Presenter with PowerPoint 2007.

I've recorded the voice narration for the entire presentation in a single WAV file (using an external program) and imported it into the presentation.

There are multiple slides to go over the top of this one audio track, and I've sync'ed everything using the audio editor.

But when I preview or publish the presentation, the audio cuts out at the end of each slide just before the transition to the next.  This makes the whole thing sound choppy, incorrectly processed and unprofessional.

I've been told by the Articulate support people that the audio drops out at the end of each slide by design.

So now I'm looking for a workaround so that the audio/narration will play continuously without dropping out every time the slide advances.

If anyone can help, I'd really appreciate it.

Thanks in advance!