Almost all cell phones today have MP3 capability built in. It would be nice to output the music to the GL aux input. BUT the cellphone connector is a 2.5mm male jack with 4 connections, mic, left, right and ground. Someone must make these jacks but I have not found one yet. I don't know if there is any standard wiring for these connectors or not. Is there anyone else who would like a cable like this or am I all alone? I don't want to buy an MP3 player when my phone/PDA has a 2 Gbyte card full of MP3 files already.