AGC (Automatic Gain Control) regulates the signal level of the audio output.
A good AGC normalizes RF signals to the standard output level, in spite of any amplitude changes. An amplitude control function includes elimination of signal overloads in static crashes, followed by a quick restore back to the standard level immediately after the overload.
Basically, all changes in the gain are bad for weak signals: every gain change also slightly modifies the "raw audio", and this is why many experienced DXers keep their AGC disabled, especially while studying some specific ID. As a result, you will need to set the gain manually in each individual case. Also, when making audio clips, one of the rules of thumb is to disable the AGC unless there is some specific reason to use it.
JAGUAR's AGC has two different modes: AGC ON (default)and AGC OFF. When AGC is OFF, the gain level is fully controlled by the user.
The AGC should not be mixed with the Click Remover (CR) even though both handle amplitude overflows. CR is good for recovering clicks caused by electric fences, i.e. very short audio bursts.
By default, AGC is always ON but ou can change the AGC status by clicking the AUDIOBAR > AGC button.

Clicking this button will toggle AGC ON > AGC OFF. If you scroll (with the mouse wheel or the left/right arrow keys) instead of clicking, you will always enter into the manual gain control mode, and you will need to increase/decrease the gain value by yourself. If you had AGC ON, the mode would be changed to AGC OFF, and you can return from AGC OFF to AGC ON by clicking the AGC button.