I downloaded and tried Viper4Android and I must say, It blew away all the other "enhancers" that I have installed and used HANDS DOWN!
The phone sounds hundreds of times better! Even using only the speaker, it sounds really great. Using headsets it just simply astounds me how much better the sound can get....
Don't worry when you search the play store... it shows Chinese characters and you might wonder how the heck you;re supposed to install and update and set the thing up.... SURPRISE!!! it installs and shows everything in English! I'm not sure why, but it works and is SUPERB!
Thanks for pointing me to that app!
To all, Aloha and Good Luck!