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I can’t figure out how to customize this and I don’t know why I should? I guess I don’t know what to look for? And I can’t tell any difference between 1,2,and 3.

Customizing optimizes the benefit of the application because the music is customized exactly to your hearing. The profiles are all different, we can reassure you of that, those are there for quick relief if you do not have time or do not wish to customize the audio on your own. Profile 1 is tailored for someone with normal hearing, Profile 2 has a slight hearing loss @ 8kHz-12kHz, Profile has even worse hearing loss through all frequencies.