Hi Tube & Sapphire - absolutely excellent, many thanks for all the great info, works a treat.
I shall of course inform my techy son, next time he's home from pretending to be a student, that I worked it all out myself !
[ He'll rumble me fairly quickly, but I'll have a few satisfying days of having worried him ! ]
And yes, aren't those Clips terrific ? The whole family have them, and love 'em. [ Aforesaid son's managed to lose 2, but keeps replacing them, says it's the only stand out gadget product - apart from the various weird things he has for doing unspeakable things to amps and guitars - he couldn't be without.]