Check it out! http://forum.xda-developers.com/show....php?t=2191223
You got to be rooted and have SuperSU on your G2. It's reported that SuperSU plays nicely with ViPER4Android and Superuser could have some difficulties.
App will install drivers for you and make sdcard/ViPER4Android/Kernel folders in your main storage. Follow instructions from the app. Basically, just pick desired audio quality / battery consumption. Reboot. If ViPER4Android folders are not automatically created, see EDIT at the bottom of this post.
In sub-folder named Kernel extract IRS files from attachment (at the bottom of this post) or downloaded Starter Pack from OT. Reboot again. In order to see Convolver / Impulse Response (IRS) files, go to UI Setting and choose Expert option.
I removed some IRS files from original starter pack and cherry picked some more free IRS files from other packs.
Superb, free, studio quality, 6 (six) sets of IRS files in this thread by @BSDgeek_Jake;
Check out another great IRS thread by @zhuhang and if you feel like it you could purchase some of his premium IRS packs to support V4A development;
Here's another awesome irs thread by @Vinardo_ZzZ 2000;
It's geared towards more advanced V4A users. Have fun!
Most music players work with default Normal setting. If you're still on Jelly Bean (4.2.2) and have problems with Google Play Music or stock LG Music Player playing local mp3's with headphones or thru speaker you'll need to edit build.prop files. Instuctions in post #218;
If you have problems with driver installation when upgrading V4A to a newer version and V4A asks you to install drivers again and again, follow instructions in post#594 and #596;
For KitKat users, who want to install V4A as system app, @reas0n wrote simple instructions... In addition, there are instructions on how to manually edit build.prop file if needed.
Also, for KitKat users with custom recovery, you could flash attached files located in post #609. Those files will make proper build.prop edits, install V4A v18.104.22.168 in system/priv-app folder and install super quality audio driver. Before flashing, make sure you removed old driver and V4A FX app itself.
Much more detailed instructions and explanations you could find in original thread or at Viper's Audio Official Website.
Viper's Audio Official English Website link;
Open V4A FX Menu/Check Update. Download and install Android 4.x apk. Other one is for old devices still on Gingerbread 2.3
For new users, download link for latest v22.214.171.124;
Download page for all versions of ViPER's Audio;
Official ViPER4Android Audio Profiles thread;
V4A IRS Headphone correction filters thread;
In this post is explanation of what it does;
I believe that's it. Enjoy!
In order to see Convolver / Impulse Response (IRS) files, go to UI Setting and choose Expert option.
"In the FX app, make sure Convolver is ticked. Then press Impulse Response and it will tell you the folder is empty. It JUST created the folder you are missing. Go back to your file manager and copy the files there." thanks to @bri315317