strange potentiometer readouts

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I've got some potentiometers on a keyboard that have B10k written on them, but when I measure them they start at about zero, go to about 2.8 in the middle, and then fall back to zero again.

I've bought some replacements that go straight from 0 to 10 so I don't understand what it means, help! how does the keyboard read 0-127 instead of 0-64-0, when the potentiometer goes up and down in the middle?

is it because it's already soldered into other electronics?
 
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