Increase headset volume ?

Hi ! I hope someone can help me...I brought i Gionee elife e7. I'm a music lover and i like to listen a lot of music but Gionee elife e7 volume (about speaker,headset ecc) is very low...not only that but my earphones listen very horrible, respect my thl w100 with mtk6589....quality of sound isn't good and volume is very low...I tryed a lot of apps but when i try to boost volume, it decrease not increase. I did not found mixer_paths.xml, i deleted gionee mixer but nothing....quality is horrible and volume everytime low...i really hope some programmer of android or someone with knowledge can help me....THe rom is the stock 4.2.2 custom (by gioonee).

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