This app helps in the lagging issue so if you have a phone which is quite old and has a low RAM then you can definitely go for this app. It is the most valued app for the control of audio. The modifying tool fitted inside this app gives us the control over the various sounds of the output device such as Bluetooth devices as well as any other thing you connect to the phone. This app comes with a built-in sound recorder and drivers with many effects as well for manipulating the sound just well. And, it also offers much more to figure out. XDA Thread: Official ViPER4Android Audio Effects (FX v2.5.0.5) – New Features & 7.0 Support.You can find the instructions for installing it on the Internet.
