How do i fix garbled audio

How do i fix garbled audio?  making slideshow with narration. have tried two methods. first to record small audio files and attach them to individual slides: easier to edit audio recorded in quick time
second method is to record voice over narration in keynote, so far as I can determine this method requires corrections to re-record entire presentation.
in either case when I play slide show my audio files play with glitches, stops and losses that garble the message.

No not always, but sometimes. I have had my macbook pro in for service they replaced a speaker and cable and dvd drive, full system diagnostic.... still having the same problem. I am not sure if it is something I am doing, software glitch requiring full restore or a memory problem... it seems almost like a streaming problem to me but i am unsure of myself and the apple system diagnosis should have turned up any hardware problems??

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