I have sourced 2 Oneplus One phones and installed UT on both. One of the phones is going to an Android user who I have convinced to use UT as their daily driver. I will be providing support!

Unfortunately both phones display a recognised microphone audio issue, low mic volume and an unbearable echo when using speakerphone.

The issue is referenced here:
http://moodyrepublic.com/oneplus-one-mic-fix/
https://forums.oneplus.net/threads/fix-call-quality-issue.284449/
https://forum.xda-developers.com/oneplus-one/help/microphone-issue-oneplus-one-t3502558

A solution under android appears to be tweaking the audio related values in build.prop .

Could someone outline briefly for me the steps needed to edit build.prop, if it even exists under Ubuntu Touch?

Is there a better way to tweak microphone/speaker/audio settings under Ubuntu touch?

Has anyone else experienced the issue on their Oneplus One?

Thanks folks, love this project, will be sticking with it and have donated.