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[María José]

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.

[María José]

By the way, we don't use potenciómetro in my part of the country.

[poli]

To vary the subject slightly, umbligo
is commonly called belly button although naval
is the proper work. Umbligo is an ugly work. Is there
a belly-button equivalent in Spanish?

[María José]

To vary the subject slightly, ombligo
is commonly called belly button although navel
is the proper work. Ombligo is an ugly work. Is there
a belly-button equivalent in Spanish?
Sorry, no other alternatives.:rolleyes:

[Tomisimo]

Thanks Rusty and Alfonso for clearing up how potenciómetro is used. :)