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[María José]

Originally Posted by Alfonso

I have usually heard of potenciómetro to refer to what you mean, a knob. I even use this term for my guitar. I'm not an expert at all, but I think this is the most common term in Spanish for this.
I have also heard of interruptor for a radio knob, especially if it's got an on/off item, but I think this is imprecise, although some people use it.

Sorry,sorry, sorry. One for each cruel correction.If it hurts too much you can complain to David and if you are lucky he'll ban me from the forums.Although you know I'll return again,under another guise.