Presonus Audio electronic Smart Compressor - Manual (Page 12)

CONTROLS & CONNECTIONS
11
after processing. ‘0dB’ on the meter is referenced to the +4/-10
switch on the rear of the unit. In +4 mode, 0dB = +4dBu. In -10
mode, 0dB = -10dBV.
Gain Reduction Meter
The Gain Reduction meter indicates the amount of gain being
reduced by the compressor in dB.
3. Output & Pushbuttons
Output Level Control
The Output control is used to set the desired output of the Blue
Max. It is sometimes referred to as ‘gain makeup’ control. This
terms is derived from the fact that as the compressor lowers the
output level during gain reduction, the overall signal level is
lowered, requiring the user to ‘makeup’ the gain thereby restoring
the original signal level.
Input / Output Meter Select
This button selects the function of the Input/Output meter. Pushed
in, the meter gives you the level of the input signal. Pushed out,
the meter gives you the level of the signal after compression; the
output level.