How can I increase incall front speaker volume? - Xiaomi Redmi Note 4 Questions & Answers

Redmi Note 4's incall earphone (front speaker) is not loud enough for me. How can I increase the volume?
I try to edit mixer files but I don't know which line I should edit for front speaker.
Sorry for my bad English.

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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?
need to increase call in Redmi note 5 pro and poco f1 and redmi note 3
TIA

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