Vicki,
If QuickTime is acceptable as a delivery medium, you can either:
1. incorporate "closed captioning" via a text track or
2. play images (or Flash) of text within the audio/video window. (Either in its own space or over the top of a movie [Flash images are better for the latter].)
For more info, see the QuickTime Developers page on the Apple site.
http://www.apple.com/quicktime/tools_tips/tutorials/ (in particular the "Text Tracks" tutorial)
-Hugh Todd
The only tool you would need for this would be QuickTime Pro, available (as a key to unlock its powers) online from Apple.
So... what's the best way to caption audio content?
How is video content usually made accessible?
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