The LED meters display the peak input and output levels. The LED meters are normalized to 0 dB at digital full-scale.
Note that when TL Aggro is inserted on a mono track, only the left LED meters will display levels.
The Needle meter shows input, output, and gain reduction levels, selectable by the buttons directly to the left of the meter. By default, the GR (gain reduction) button is selected and the meter displays the amount of gain reduction TL Aggro is applying on the input.
When in GR mode, the needle instantaneously reacts to peak reductions that occur. The red scale of the meter indicates compression in dB. This gives you an accurate representation of the total amount of gain reduction being applied. However, the release speed of the needle is limited to give it more natural motion. At fast release settings, the instantaneous gain reduction might be less than what it is presented by the needle.
In Input (IN) or Output (OUT) mode, the needle meter displays an average of the signals roughly approximating the RMS (root-mean-square) strength of the signal. The grey scale on the meter represents the input and output levels in negative dB This gives you a better representation of the overall loudness of the signal with respect to the LED meters.