Hi there Capt_pants and welcome to the community
To the best of my knowledge, there is no way to link back to
a specific point in a slide as any navigation always takes you to
the beginning of a slide. Please bear in mind that Captivate does
not actually have frames like in Flash and the timeline is merely
that, a timeline measured in seconds.
If possible, try to break up your dialogue over as many
slides as you need (e.g. have 10 error section, therefor 10
slides). Thus you can now navigate "back" to the slide with the
relevant audio that you want to.
hope it workds for you
Andrew