What you will need for VIPER4Android: The App itself: You can download the latest official APK of VIPER4Android here: Alternatively, a direct link is usually common: The APK to download for your version of Android is clearly marked - make sure you get the right one. IRS Impulse Response Sample files - this is where the magic happens: I’m providing a zip file containing some “Dolby IRS” files I use and that works very well - download and extract this: https://drive.google.com/file/d/0Bw4IPFHUFpo7M0tDaklueHRibXM/view?usp=sharing There are other IRS files available (search XDA Developers forums) and once you’ve placed the folder on your device to put them all in (I’ll explain that later) you can simply put the .irs files in that folder and try them out to see how they affect the sound output. See here for more IRS files to try out: http://forum.xda-developers.com/showthread.php?t=2191223 http://forum.xda-devel...