Just confirming that there is no problem at all operating an iPhone for calls via bluetooth while another device is plugged in for music.

Furthermore the iPhone can be plugged into to the other USB and on charge while the music device is plugged in. The only tip here is plug in the music device, allow it to establish it's connection to the sound system, and then plug the phone into the other USB port. If yuo plug the phone in first the sound system will connect to the music files on the phone and then ignore the music device.

The flashdrive route works well but like bluetooth music the file navigation is not as good as a direct connection to an iPod into the sound system. I do not use the flash drive because when I take my music into the car I want my entire music collection available to me. These silly little nano type devices and flash drives, I don't see the point of. It's an old 80gig iPod classic for me. I realise I am a minority on this but I cannot for the life me figure out why.

And I also realise I am taking this thread off track, apologies