Fine (F) or Coarse (C) Control
This button determines the increment/decrement associated with the UP/DOWN arrows. Fine produces small steps in value, while Coarse provides large steps in value. Clicking on the button will toggle the setting.
Polarity Control (+/-)
This button determines the polarity of the signal. A + indicates that the signal will not have it’s phase altered. A - indicates that the signal’s phase will be changed 180°. Clicking on the button will toggle the setting.
Mute Control (M)
This button determines if the input signal will be muted. A black M indicates that the signal is not muted, while a red M indicates that the signal is muted. Clicking on the button will toggle the setting.
Processing Components - Crossover