My iPod Rouch has the worst sound quality I've ever heard through headphones. It was fine when I bought it, but suddenly its vocals are a distorted mess and the volume is extremely low. I thought it was a problem with my headphones, so I bought a new pair. The sound was still terrible. I tried the same music on my old 4G Nano, and it worked fine. I think the problem is with my iPod touch's headphone jack, because music played through the built in speakers is fine. I also noticed a disconcerting grinding sound when I plugged in headphones most recently. What is wrong with it, and will it be covered by warranty? I'm very angry about this.