External iPod Controls is a handy tweak in Cydia, developed by ipodtouchmaster, that converts your volume buttons into iPod controls. You will be able to skip to the next song by pressing the “up” volume button and skip to the previous song by pressing the “down” volume button.
Where there’s no music playing your buttons will work as they normally would. When there’s music playing and you want to change your volume with the buttons, no problem. After a pre-determind amount of time (which can be changed in the settings) of holding down a volume button, the volume will start to work as your would expect.
Note: This tweak works on any iPhone or iPod with external volume buttons, and it works on all modern firmwares/iOS (3.0 and above). Requires a device with physical keys, and there is no visible icon. The settings are in the default Settings.app.
External iPod Controls is available in the Cydia Store via BigBoss repository for $0.99.