Marshall London increase volume mixer_paths - Android Q&A, Help & Troubleshooting

Hi, someone can help me to change mixer_paths.xml to raise the volume beyond the limit set by Marshall or Android?, I can not find the values to be changed like i see on internet,or what to edit to increase volume? i try many software but no efect or distorsions

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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] How can I boost speaker volume?

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?

[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

Increase speaker volume

I need help with increase speaker volume. I try everything nothing works. I got 4-5 mixer paths with diferent name edited all of these.. Rx volume digital 1-2-3-4-5 nothing change for the speaker i can only increase the headpones. Maybe în the mixer paths should turn on something? Help me .. Plecase guys.. Someone help me... ?

Increase audio volume from jack

Hello
I found way to increase volume from jack on A21s u need AOSP from Wer99, or other ROM with root, and method to edit files in /vendor/ directory like Solid Explorer app.
Maybe this way works only on European devices, because USA versions have not limited max volume by statutes.
File to edit is mixer_gains in /vendor/etc. You need to find section <gain-media-handset> and edit "DAC Gain" value, i set it to "150 150",
and <gain-media-headset> value "DAC Gain", i set it to "150 150" too.
On my phone volume from jack on headphones is much louder and enough for me, maybe with other values it can be louder.

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