sorry guys.... been a bit too busy to post pics and make people jealous
here you go:
and the S4 doesn't have enough buttons from what I can see!... the R8 (leather S-line version?) like this is just about right
there's a button and clickable scroll wheel on each side....
Left: the wheel is to scroll through MP3/CD tracks or radio stations and clicked in to tune for radio stations and to ffwd the MP3/CD in regular mode, or you hit the "Mode" button and then the scroll wheel switches to the phone controls: then the wheel scrolls through your last dialed numbers on the DIS and you click the wheel in to start/stop calls.
Right: volume control for the "active" audio... so that's the music normally, but if satnav / SDS / telephone voice is active when you scroll the wheel, it will control those volumes separately and then fades back and forth between that and the music at those pre-set volumes, if you click the right wheel in, it will repeat the last sat-nav direction
The voice button next to that will activate the SDS voice controls, so you can say things like "Navigation, Navigate to
home", "Radio, change stations to
Radio 4 sport", "Telephone, call
bossy person's mobile" (wife never has to hear that, I hope!
)... (you have to pre-set the names in italics byt finding that station / entry in the directory nad saying "Save station" / "save name tag").