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iPad Accessibility - Background sounds

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This video will demonstrate how the iPad can be used to facilitate a calm, reflective, and focused learning environment by playing soothing/calming sounds when working.

This is an excellent way to showcase the smaller but equally as powerful settings that are built into the iPad. 

How effective would this be when used as a whole class?

What about for an individual? 

How might this be counterproductive and what can you do to mitigate that?