I have an Ipod 4th gen, and it wont play vocals through headphones, but will do it fine through speakers. Every headphone and earbud I use has the same result. I can ear the rest of the music, but the vocals is either missing or can barely be heard. I tried using the vocal booster setting in the EQ settings, but it only barely helps. Any ideas on how to fix this? I was just going to reset it tomorrow, but if there is an easier or better way please let me know. Thank you.