I have some hearing loss, and would like to set a profile in an audio equalizer to boost the frequencies I'm deficient in, in all audio output, regardless of the app outputting them. My hearing aids do this, but I would like to be able to have it happen when I'm listening via earbuds, or perhaps in my car listening to audiobooks or music playing from the iPhone.
It seems like an obvious function, that many babyboomers would enjoy, and may already be there. I'm told this is possible in Android systems. Is it possible in iOS?