Static in Multi-track Audio Files

Greetings! I have numerous audio files that I recorded in Audition that work fine in Articulate. Then I went in and made them multi-track audio files that I mixed down to mono files (added computer keyboarding sounds along with the narration). The first two files that I imported into Articulate worked perfectly, however the remaining 20+ play loud static upon previewing each slide. YIKES! Does anyone have any ideas?

Thanks!

Shari

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