Exporting to QT on Keynote with embedded narration or audio files doesn't work

Question

When I create a Keynote presentation, I often publish them for viewing after the presenttion.  I have been making presentations for a long time and never had luck with Keynote using narration.  When you edit a narration, it first "appears" to erase everything from the point you choose to edit forward.   However, when you finalize the presentation and export to QT as a movie (yes the edits sound fine when you are using keynote itself) EVERY PREVIOUSLY RECORDED TAKE on each slide will playback at the same time making the audio incomprehensible.  I'm using a 2013 2.3 GHz quad core i7 with 16 GB DDR3 and the newest Keynote 6.01 2013.   Narration has NEVER worked properly on any previous version, and still doesn't.  
I had some advice to try recording QT audio and adding to the slide.  Now, when recording to Quicktime, it does embed it, but in recording the presentation, it either doubles up the audio giving a strange echo or does the same thing if you ever edit the presentation.
Keynote is simply a buggy inferior product for use in recording presentations as far as I am concerned, and I am very very disappointed in Apple for not figuring these issues out.   It's not a new product, and it's not as if most educators are not participating in on-line posting or sharing their work as movies for later viewing by students.  
I'd appreciate hearing what others do to work around these issues before heading back to Powerpoint or having to make complex i Movies with slides as images and adding qt narration to the movies.   Keynote claims to do this... it just but I've never encountered an apple product with more bugs. 

Answer 1

I had some advice to try recording QT audio and adding to the slide.  Now, when recording to Quicktime, it does embed it, but in recording the presentation, it either doubles up the audio giving a strange echo or does the same thing if you ever edit the presentation.
The problem Keynote has is that the sound and image content are not locked together which causes out of sync errors. This is why many users choose video editing applications when using sound in the presentations, as they have both image and audio tracks to sync sound properly together.
Start a new presentation to remove the previous sound recording, Keynote is holding onto the other sound files.
Add the graphic items to each slide and one sound file to each slide for the voice over
1 - In Inspector > Transitions;  use start transitions automatically and set each transitions delay to the duration of the individual sound file.
2 - In QT export, set Fixed Timing and delete the value in the duration box, QT will then use the custom timings for each individual slide.
This procedure does work exactly as needed, Iv used this for nearly 6 years using 4 different versions of Keynote.