Buzzing sound on courses when viewed on ipad

Hello. Our users are experiencing a buzzing sound with all of our courses that were developed in Storyline. It only occurs on the ipad (no issues on laptops) and only when using earbuds. I would have thought it was just a bad pair of ear buds but it happens with all users on all ipads in a variety of environmental scenarios. I don't have any idea where to even check the files for a fix. Any ideas where to start?

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