B21 said:
It’s a bit late now but I looked at it and gave up..apart from usb charging which is easier with a unit in the cigar lighter I couldn’t see any use..pity it was a neat installation for the earlier iPhones..
Yeah another USB just for charging probably wouldn't be much use really. But if you could get the blue socket working on the Combox then you'd have another music input. But as is stated, I've only found the one post stating that they got it working, but with no details other than them stating that they had an adaptor for the USB port from the proper blue cable.
But, TBH you've already got a 20gb hdd (can be updated/upgraded), you can use a 64gb memory stick which would house tons of music, you can stream from your phone (if you have the Combox) and if you fitted an mmi box then the worlds your limit... so the real question is, why would you bother with another USB port?

My answer would be, because I can (could, may, might, might not, probably can't

)