Ich habs im Sony Blog gefunden - und es klappt tatsächlich. Allerdings scheint es abhängig von der Rom (Custom, usw) zu sein. Versucht mal Euer Glück QuellUrl: Xperia X10: Increase Head Phone Volume For X10 mfg Quercus Increase Head Phone Volume For X10 Here is a quick fix to increase the headphone volume on the X10, and this will work on other Android devices as well. So go to your market and install a application called "Louder Volume Hack", "hint google is your friend. After installing it press on the speaker and you will get the following screen. Note - Do not play anything and have headphones plugged in when doing this Now in order from top to bottom hit the circled buttons. After you press a button it will apply the mod to your phone and then on the bottom of your screen you will get a message saying "successfully applied to phone" or something. If you get a error message just try it again until you get the successfully applied message. Once you are done hit exit and you are done. I tried this method when I was on the bus to see if it works, and surprisingly it did. I noticed a significant increase in headphone volume. I am not sure about the head set volume thou.