HP 8712C - Knob

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Knob
The front panel knob is used to increase or decrease parameter values. The
front panel knob is used to give an analog feel to the setting of the values.
Any of the values that can be set through the numeric entry pad, or the step
keys, can also be set using the knob. However, the rate at which the active
parameter varies, for a given amount of knob rotation, is dependent on the
parameter that is being controlled.
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