I have tried multiple equalizer apps, only to find out that not one of them affects the sound output of Pandora. I'm looking primarily for stronger bass, but multiple bands of eq would be great, too. The strange thing is, Pandora's ads seem to be controlled by the equalizer (for instance, "Music Volume EQ"), but not the music itself. I have emailed both the developer of that equalizer app, and Pandora, and neither has been any help. I don't want to replace my earphones, which seem to be great (they deliver awesome bass when it happens to be there in the music already) and I'm hoping for a free app, though if I found one that actually works, I'd be willing to pay a few bucks for it. In case it matters, I'm on T-Mobile and running Android 4.3 (updated from the original operating system).