Round 2 of the new to GPS world - Zumo550, IPhone4, Scala Rider G4 Headset

Bluetooth - Phoned paired to GPS, Headset paired to GPS, Headset paired to phone.

Turn on GPS picks up phone and headset - voice over comes up "GPS Connected"
I can make and receive calls thru GPS but for some reason there is no sound, can't hear music from GPS (can when connect ipod by cable). I have followed all instructions to the letter for both GPS and headset. I haven't found anyone with a matching headset yet (mate is close to buying if i can get mine to work) to check if comms works
Any ideas???????

I have got the Bluetooth working randomly - is this normal??? Headset works direct to the phone - throw in the GPS and it all goes pear shaped.
