In article ,
Richard Tobin wrote:
In article ,
Dave Plowman (News) wrote:

Approach the speaker and the buzz drops in level and get close enough
and it goes. So you can play it with a hand rather like a Theramin. ;-)

Can other people hear it?

Heh heh. Yes. It's hardly subtle.

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*Letting a cat out of the bag is easier than putting it back in *

Dave Plowman London SW
To e-mail, change noise into sound.