She was referring to a audio seminar that took place a couple months ago, the audio from that webinar was overlapping. She's not having problems with the GameSalad program. Good advice, though!
The sound is overlapping? Well, see... sounds are supposed to overlap. They're meant to be used for environmental texture and such, so they go along with each other. If you don't want the sounds to overlap, you'll have to import them as music. You just drag an mp3 into the program and it will give you the option to import the file as music or a sound. Import them as music, and they won't overlap.
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I hope I wasn't too late, if I helped at all.