Hello everyone,
I have an S10 under e/os v2.8. Everything works well except the sound which is too low (for music etc. I installed an application to boost it but for calls I can’t solve the problem). Do you have any advice?
Thanks in advance 
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When you press volume use the small < symbol at the bottom of the volume and check the other volume setting? I don’t own the S10 so can’t check.
I pretty much always have to use speaker… never occurred to me it would be a software problem…
There is a known problem with some samsung devices, low in call volume.
There is a solution, worked for S10+ and S10e, so maybe also on S10.
Replace, mixer_gains.xm, with an edited version.
See solution link in post.
I have a OnePlus though
There are solutions for Oneplus, but you need to know your way around with ADB,
https://xdaforums.com/t/mod-volume-increase-mod-for-oneplus-one.2835010/
Or maybe , https://xdaforums.com/t/how-to-fix-low-call-volume-low-microphone-issue-with-oneplus-one.3318304/
oh wow cool!
looks like both require root though?
Yes I believe root acces is needed.
But With Samsung it seems possible to gain temp root acces with ADB root command.
Backup all your important files, pictures, and all, to be sure
In dev options enable,
Usb debugging enabled
Rooted debugging enabled
in Terminal,
adb root
adb remount
After that it should be possible to do a pull and push with the file
First did a,
adb pull <dir/filename> to have a copy of original and then
adb push <dir/filename>, replaced the file
credit to devs on XDA