How to tweak the volume manually

Video tutorial:

Thanks to @ jenenser83 for providing the video.This guide explains how to fine tune the speaker and headphone volume. The file that contains these values is "mixer_paths.xml" which is found in /system/etc/mixer_paths.xml.I recommend using ES File Explorer as it allows you to edit the file directly on your phone. Before you start modifying you need grant ES File Explorer root access. To do this press the icon in the top left corner then scroll down and select Root Explorer, then select Mount R/W, then select RW for both / and /system.Open ES File Explorer and navigate to /system/etc and find the file "mixer_paths.xml"Tap on the file and select ES Note EditorPress the menu button in the top right corner and select EditFind:You will see this string just below it:The value is the only part we are going to adjust.For the mod above, I changed the value to "93". The default value is "88" and I would suggest not to go over "95".Find:Look for these strings below it:Again all we are changing is the values (ensure both are set at the same number).For the mod above, I changed the values to "20". The default values are "15" and I would suggest not to go over "20".When finished, press the arrow in the top left corner and save.Lastly Reboot your phone.More to follow....