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I have been having the same issues and contacting tech support has been an expierence of them basically blaming me for issues and when it became obvious it was a problem with Power Director's AAC encoder, I haven't heard back from them in about two weeks now. I provied source files, the bad produced video, and a comparison produced video from Corel Video Studio that sounded good. For the one video I needed to complete, I had to output a .wav file from Power Director and import the video and audio into Corel Video Studio to produce a useable output. I don't like the usabiltiy of Corel, but I got an upgrade price of $15 that made it a little less painful. If Power Director doesn't fix the issue, they will loose me as a customer forever. This was never an issue until this latest version. Trying to use my older V13 Power Director, still on my computer, now has the same issue. I was thinking of trying to reload V13 to see if that fixes the issue for at least using V13. Or, maybe I will just have to srcap everything and go to another program entirely. 
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I was pleased to find this thread because I've had exactly the same problem with PD14. In my case it seems to be particularly solo wind instruments that suffer the most distortion. Producing the video as WMV seems to cure it but I would prefer to use MP4 if I can.
Is there any software that will allow me to substitute the audio later without losing video quality - i.e. without having to re-encode the video?
Alan
I downloaded the trial version of Edius and it created a perfect sounding MP4, using the MP4 video file from PD15, and an uncompressed WAV file I created in post. But the trial only works for a month.
I don't know if Edius re-encodes the video... It did take a long time, but it still looks fine. So I think it does not re-encode anything that's unchanged.
I did find some freeware which allows you to change the audio track in an MP4, file but never tried it. You can Google as I did, and please let us know if anything works.
Hopefully Cyberlink will improve their audio output in a future update.
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Thanks, but I tried that and apparently Power Director 13 is doing the same thing now that I updated to 15. The only way I was able to get this to work was bringing in the video and sound for the video into an old version of Corel Video Studio, but it has very limited output options. At least I know it works in something else. I can't produce the entire project in Corel. I hope they provide an update fast! I am stuck and upset.
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If an update isn't available fast, I will have to go back and completely reedit my entire video in the older version.
Before you do that, you might try this (this is what I have been doing to get decent MP4 audio):
1. Edit/produce the video in PD15. (You apparently have done this already).
2. Produce just an audio track from PD15 in WAV format.
3. Run PD13 (or earlier version)
4. Import video from step 1, audio from step two.
5. Mute audio track from step 1 video.
6. Produce using SVRT. Sound is perfect.
The whole process adds about 5 minutes which is five minutes more than it should.
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If your source clip’s audio is stereo then try this: Change the Preferences audio from stereo to 5.1. Produce again to the same mp4 profile.
Let us know if this helps.
I am having the exact same problem with Power Director Ulitmate 15. The sound is terrible when final produced. I tried changing the audio preferences from stereo to 5.1 without any change in the output. The preview of the video after the video produces sounds fine, but if you play the file with anything else, or import it back into Power Director as another clip, the sound is garbled. You can hear it, but it is like there is a ghost track that is garbled.
It could be that the audio phase is getting messed up in rendering code.
If an update isn't available fast, I will have to go back and completely reedit my entire video in the older version.
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