I actually meant to suggest using video software, instead of presentation software, but it didn't come out that way. That's why I suggested turning it into a movie. As Dave said, iMovie can do it easily.
OK, then it's a four track system, with the signals on the tracks that are usually Side B. So, there's no practical way to hear the signals, unless you somehow find a four track cassette deck. Good luck with that!
We seem to be in agreement. You just have to do it manually.
I used that type of equipment back when I was doing presentations and photo classes. Typically the signals were recorded on the reverse side of the cassette. In other words, on the "B" side, and the player could access them as it played back side "A". Simpler ones used only the "A" side, with...