mixer_paths.xml file not found

I am using lollipop aosp rom on my Lenovo a7000 phone. I want to boost my phone volume by editing the mixer_paths.xml file. However I did not find it in my root directory/etc/ folder. I have my phone rooted and used es file explorer with the root explorer switched "On". I also double checked in my superuser app that it has root privileges
What should I do?

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