No sound from some audio clips suddenly

Made a 55min movie from multiple video clips and narrated with several audio recordings and added music tracks as well, suddenly some audio clips after the first 30 mins show up blank, when viewing audio waves and their volumes are set fine. Other audio clisp in between works fine thou.
Found this after having exported and shared to iDVD, Audio wave files and Media files seems fine in the project folder/content. what happened and have could I possible recap output from these clips again?
BTW HD ***** on sound facility and sometimes disstores sounds during playback when a project gets too large, sometime after saving project and emptying trash, it might work again for a while
Googled around for few days now with out any solutions, any hints?

Hi stefw,
I assume you've already done the following:
(1) Make sure the audio checkbox is selected for the track you want to hear. The audio checkbox is to the right of each track in the timeline viewer.
(2) If the audio checkbox is selected, then choose View > Show Clip Volume Levels and see if the audio levels for the tracks are set to a level that can be heard"
If so, this is what I'd try.....with your project open, start an new, empty project. Go to the original project and copy one of the clips (highlight it and then FILE....COPY.) Go to the other project and click in the second line of the timeline and click FILE...PASTE. Make sure the audio checkbox (on the far right) is selected for that line and attempt to play it in the new project. If it works, drag it back into your original project and try it from there.
If that doesn't work, look for the. aiff files in the original project file in Finder (find the file, right click, choose "Show Package contents", then look in the media folder.) Drag that file into the new project and attempt to play it. If it works, drag it back into your original project and try it there.
Hope it works out for you.

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