I agree with Selden, that would be VERY, VERY usefull for educationnal activities.
Running a script with sound in Celestia and displaying it on a TV ( or a videoprojector) would be much easier than capturing a video (not that easy with Celestia), editing it, adding sound...
Although I know there are other priorities with Celestia at the moment, I think we have to keep this question of sound in mind...
And I hope that my significant experience in sound configuration and edition will be usefull in a not-so-far future...
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