My Droid 4 (rooted) has very low volume at the earpiece during phone calls. The volume is maxed, but in-call volume is so low I can barely hear the voice on the other end. Speaker phone, bluetooth headset, and headphones all sound fine (or even too loud at max volume), but the earpiece is very low. I tried the "Earpiece" app, but could barely notice a difference when I put in the maximum possible boost. I have also tried cleaning the earpiece. Does anyone have any other suggestions? Is there some way to artificially boost the in-call volume beyond the max?