Can anybody tell me how play MP3's through the AUX port on a Kenwood KDC MP 235 head unit? I've tried holding "Menu" to scroll down and turn on AUX but it just says "BEEP: ON" and there's no menu to scroll though. I can press SRC and it'll switch from CD to radio but even if my ipod is playing it won't recognize AUX. Any help guys? I'm about to go over 2k miles to pickup a '61 Beetle and I can't afford to burn tons of CD's.