Ive not tested this on GPE firmware but you can give it a go. If there is such a file (mixer_path), and there are the said lines, then try to change it. As usual, perform a nandroid backup in case anything goes wrong. Use this method ONLY if the said files and lines are present okay? I can safely say that it works on CM based roms.
forum.xda-developers.com/moto-g/general/headphones-volume-increase-cm11-kitkat-t2830060 <---- I'm talking about this
To be honest, Ive tested this on crappy AND good headphones I didnt notice any distortion (i dont have audiomods, i dont increase bass or anything nor have i experienced distrortion on high frequencies) so I'm a bit dumbfounded. Different roms have different ways of managing audio, i guess. I really want people to focus on this issue too. Ive been looking here and there for a solution to be honest. I hope you'll find a solution and share it here
There are kernels for GPE that have fauxsound implemented (supposedly its very good at inxreasing volume) but the problem is you have to pay to be able to use the feature using a paid app. I had problems with it where the volume boost wouldnt stick after a reboot, but im not in anyway from stopping you to try it out. You may get different results. Try looking around our moto g forum (for kernels that have fauxsound)
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