Application Description
RNS:: Clie Jog MP3 Playback Hack (CJMP Hack) overrides default Jog Dial navigator`s functionality with its own:

• Push the Jog to toggle the playback.
• Push-and-hold the Jog for the next track.
• Rotate the Jog to adjust the volume level. 

...any time, anywhere!

You can however toggle between the default and the CJMP Hack functionality at any time by the press-and-hold of the Back button.