Low and horrible sound quality from internal mic - LineageOS Questions & Answers

Hi guys,
I know that I think that this question/issue is well-known for some LOS users, but not really sure if it was fixed on some devices, or some ROM builds.
My problem is regarding to the low volume, although I could increase the volume by playing with the dB gain feature on some apps; but more remarkable is the poor sound quality while recording audio using the internal mic (mainboard). And if I use headphones (with mic) the recorded audio sounds perfect.
I read somewhere that could be related to the 'Active Audio Cancellation' feature on some devices, allowing to reduce the environment noise to talk better. But, if it's what happends, makes the app to record the audio in such a way that it can not be heard correctly due to the "cuts" that occur continuously.
I though in checking:
· system/etc/audio_platform_info.xml
· system/etc/audio_effects.conf
· system/etc/media_profiles.xml
· system/etc/mixer_paths.xml
. . . but not sure if will fix something, and what to look for exactly.
Thanks

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