What on earth is the world coming to, with all of these (seemingly un-nessecary) warnings.
Are they there, to fend off likely lawsuits,
(well, you were warned! sort of thing) from injury caused by people not having thier brains in gear when they use various bits of equipment.
But Paul, the day I need to turn off the Mains AND remove a fuse to hook up my RCA leads on my stereo, is the day I hang up my Toolbelt, mate, I'll take up flower-arranging, much safer, and prettier too!.