i cannot find "edit" 
another option
3. can i install cd changer, and just bypass right/left channel audio into separate jack? In that case, head unit will communicate with changer, there will be a cd spinning, but real audio source...would be non spinning mp3 player
another option
3. can i install cd changer, and just bypass right/left channel audio into separate jack? In that case, head unit will communicate with changer, there will be a cd spinning, but real audio source...would be non spinning mp3 player