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Strategies for synchronizing alt-formats with narrated power points?

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From: McMorland, Gabriel
Date: Jul 8, 2013 9:26AM

Our online courses use a lot of narrated power points, where the slides automatically advance while an audio lecture plays at the same time. We want to provide alternative formats for students who cannot hear the audio and for students who can not see the slides.
Students need a way to match up their alternative format content with the content they are able to access from the narrated PowerPoint. The lecture content and slide content must still be synchronized.

Please tell me strategies you have used in similar scenarios. I have some ideas, but I'm very interested to learn what others have already learned about this.