Yes, you can certainly output your audio at 44000, if that's what your asking, Kat.
As for Project Properties, those are set up when you create your project. They can't be modified mid-project.
May I ask how do I output my audio at 44000? In the player monitor, just just exporting the project, it doesn't play properly without.
What are the requirements of your output, i.e. the format, the settings, etc.?
That will determine how to set the audio.
WMV format, widescreen
30 fps (I'm going for around 5-29 though)
44000 khz audio
Shall I convert to avi instead?
It depends on what you're outputting your movie for.
Is it for online viewing? For use in another video project? For output to disc?
The destination determines the output format.
DVD, yes. And possibly the web. It's about five hours long.
How do I set it to 44000?
For DVD, the output format should be either PCM/WAV, or DD AC3 @ 48KHz 16-bit.
Now, if one starts with Audio with a 44KHz Sample-Rate, PrE will convert that to 48KHz Sample-Rate, at the time of Conforming. Nothing for you to do at that point.
For a bit of background, the 44.1KHz was the CD Sample-Rate, but 48KHz was chosen for DVD, and for SACD (Super Audio CD).
Another aspect of the Conforming process, and one that the user almost never even sees, is that the Audio is converted to 32-bit, floating point, for precise editing.
If you are going to DVD, then you want 48KHz 16-bit Audio. If you need other formats, then you might squeeze a little more space out of file size, by dropping the Audio Sample-rate down to the CD standard of 44.1KHz, but not by much. Personally, I would not worry about this. Now, if you absolutely do need the 44.1KHz, most formats will allow you to choose that.
PS - For DVD, you cannot choose 44.1KHz, as that is not in the standard.
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For a complete list of ALL of the DVD specs., see the link in this ARTICLE. It will tell you everything that you want to know, and so very much more.
Good luck, and happy reading - BTW, Jim Taylor's book is highly recommended to anyone doing DVD's.