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music is too quiet, any app that amplifies the sound

Have you gone to Settings>Music>Volume Limit to see if the maximum volume has been limited. Removing the limit will make it sound louder in headphones but could damage your hearing if you turn the volume all the way up.
 
If you're looking for an app that can raise the volume if the internal speaker beyond the maximum normally allowed, I don't believe there's such an app.
 
I had such app on iPhone 3gs but that app is not available any more. I use power amp on Android phone and it works fine.

I want to raise sound in headphones
 
I had such app on iPhone 3gs but that app is not available any more. I use power amp on Android phone and it works fine.

I want to raise sound in headphones
You mean beyond the maximum in settings, as in my earlier post? Is that older app in your App Store purchase history? If so, you should be able to re-download it.
 
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