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A bad jog wheel on the Akai MPC2000XL will cause settings to jump
around unevenly, or not to change at all.
The circuit component (left) that translates the wheel's rotation into on-off signals
for the computer is a rotary encoder.
The jog post, or stem, can work loose and pull out
of the encoder's frame.
Fortunately, installing a replacement encoder isn't a huge deal.
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