1. Put modified framework.jar to your phone's sdcard.
2. Open the phone's file manager which have root access and copy the modified framework.jar to /system.
3. Set permission to rw-r--r--
4. Move it to /system/framework. (Select yes for overwrite.)
i also created a zip Specially for OPTIMUS BLACK i pulled the beats audio libs and bin files from a Rom with beats audio and also added the Xloud files to make it sound with better quality and also in some cases sounds even louder i have beats audio headphones and i was able to tell the difference try it out and let me know thanks... credit goes to RockoDev who have done this awesome work..
Install it via Clockworkmod recovery...