[Q] How can I boost speaker volume? - Nexus 9 Q&A, Help & Troubleshooting

Trying to find a way to boost speaker volume but can't find any relevant values I can change in system/etc/mixer_paths_0.xml Any ideas?

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Boost phone volume through headset - default_gain

I have a question about default_gain.conf. I have found many threads on how to boost volume to the headset using default_gain but from my testing this only effects music volume like pandora. My incall volume is still very low. Does anyone know the values I need to modify to adjust just the incall volume through the headset port?

Headphone volume increase

Does anyone know which value to increase in mixer_paths.xml to boost headphone volume?
This might help: http://forum.xda-developers.com/oneplus-x/help/how-make-notifications-louder-t3259208

[Q] Which values to tweak in order to increase in-call volume (mixer_paths.xml)

Hello,
I have a rooted z2 and I would like to know which values to modify in the mixer_paths.xml file in order to boost the in-call volume, could you please help with this ?
Things that I already did:
- make sure that volume is already at its max during call
- try music app and noticed loud and clear sound so the speakers are fine
- tried several apps to boost volume to no avail
I have attached the file, please feel free to suggest which lines to edit

Boost Headphone Volume with Root?

Wondering if anyone has found a way to amplify headphone Volume any louder. On the s8+ I used the dual speaker mod that used to tweak the mixer_gains file. I've manually increased the values there but I don't seem to have noticed any difference. The volume is too low at the minute I like my music LOUD.

In-call volume (speakerphone) and Mic gain using Mixerpath.xml

Hi,
Does anybody here have the knowledge of editing mixerpath.xml for inceasing in-call volume and mic gain and increasing call CLARITY ???
I see that there are multiple mixerpath xmls in system/vendor/etc and also there are multiple "volumes" default value for all is 84.
I wen ahead and cahnged all 84 to 92 but i think thats not how it works.,
Some value is for top mic sensivity for noise cancellation and one is for real bottom mic sensitivity and one if for speaker voilume and one for earpiece volume.
If somebody with the knowledge can be kind enough to let me know what values are what?
TIA
I am months same question to this, a unique way to get and change the custom kernel that has the volume control configurable via the application kernel manager. I wanted to do the same manually in the file mixer xml as well, but it seems that nobody got it, or hides how to do it.

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