My headphone volume is not very loud on Iphone 4 on max volume setting. Have turned off equaliser in settings which helped a bit but would like it a bit louder still. Are there any settings I have missed in itunes to increase the volume of the music on the phone? All of my music is obtained outside Itunes so maybe there is something I can do before I import to Itunes? It's not a huge issue but another 10% volume would be great occasionally.