I just got the CD-UB100 installed today, it allows you to use USB flash/external hard drive to play your music. I'm anti Apple and just hate the ipod. I was looking for a way to plug in any MP3 player besides the ipod, I then saw the AV2 port on the brain which is just a standard audio jack. I plugged in my cell phone and it worked, however on the N4 there's just a black screen, there was no way to get your default background or songs to show up. It was in Video mode and that's the only option it had, but the songs still played. You would just have to control it from your mp3 device. First off