Thanks for the quick reply, Rod.
No, he's not using closed captions. He's just putting a lot of text boxes on screen, one after the other. He's not repeating everything he says, but what he thinks is important, I guess.
The closed caption route sounds good, though I guess we'd have to work out where that will be best placed on the screen. Sounds easy to click on and off, and the text will always be in the same place rather than jumping around. A good solution.
Thanks very much!