Steinberg HALION4 Mode D'emploi page 181

Dynamics Effects
Peak – RMS
Determines whether the input signal is analyzed according to peak or RMS values or
a mixture of both. At a setting of 0 % the Expander uses Peak sensing only and at
100 % RMS sensing only. Peak means that the Expander directly senses the peak
level of the sound. RMS is an abbreviation for root mean square, a statistical measure
for the amplitude of sounds. RMS means that the Expander senses the average power
of the sound. Peak sensing responds faster than RMS sensing. Typically, Peak
sensing is used for transient and RMS sensing for sustained sounds.
Gate
The Gate effect passes sound only to its output if the input sound exceeds the set
threshold level. Sounds below the threshold are silenced. An internal side-chain filter
allows you to analyze a filtered version of the input sound instead. This way, the Gate
detects only certain frequencies of the input sound.
Threshold
This setting determines the level where the gate is activated. Signal levels above the
set threshold trigger the gate to open, and signal levels below the set threshold close
the gate.
Filter
This activates the internal side-chain filter. When activated, the input sound is filtered
before it is analyzed. The Gate opens only if the filtered sound exceeds the set
threshold. When the Filter button is off, the filter controls are disabled.
Filter Type
Here you select the filter type for the side-chain filter. Select high-pass (HP) to detect
high, band-pass (BP) to detect mid, and low-pass (LP) to detect low frequencies only.
Monitor
Activate this to listen to the sound of the side-chain filter. The Gate is inactive when
the Monitor button is activated.
Center
This sets the center frequency of the side-chain filter.
Q-Factor
Activate this to adjust the bandwidth of the band-pass filter from wide to narrow.
Attack
This determines how fast the Gate opens when the sound exceeds the set threshold.
The longer the Attack time, the longer is the period for the sound to fade in.
Hold
This sets a time period during which the Gate is applied after the sound falls below
the set threshold.
181
Effects Reference