You can control the volume through the steering wheel.. its just the tracks you have to change manually mate. I think this is the same with all after market phono lead conversions. You can buy the Nissan wiring loom for a little over £60 plus vat iirc, I saw this on another memeber thread and I would image that will allow the full control via the wheel
Alex
It's a shame really as my last car BMW 325i SE hardtop has an iPOD lead/wiring loom and i could actually change the tracks on my steering wheel control. And i could also see the track titles and songs thru the iDrive navigation system. Missed my old car in this weather now that the sun's out but the Zed is a lot more fun..lots of raw power and noice.