I have a workaround, where I record it separately then use that audio and copy/paste the text into the dialog box for accuracy, but I was hoping there was a way to change it.
That's the way to go, unless you choose to add the dialogues in post-production, which I think is not recommendable (on the other hand, you'll always have the option to edit the audio with your favourite video editor).
And, as you've pointed out, what's highly recommended is pasting the text in the dialog box. It does help a lot to the lip-syncing routines.
I tried messing with my computer's default voice to see if there was a connection, but it wasn't.
Again, I think not. And rest assured this is not a limitation from running Moviestorm running on a MacOS X: it happens also on a Windows systems.
As a side note, there are lots of "realistic" sounding voices out there. They aren't great for acting purposes, but for folks putting together educational products, it's passible.
Ah, the day TTS systems will be able to convey emotion... But yes, a naturally sounding voice pack might be a worthwhile asset for some purposes.