TC-Helicon VoicePro - Manual (Page 46)

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Section 6: Detailed Parameter Descriptions
HARMONY | EQ
The EQ in the Harmony Block is designed using double
precision filter algorithms. The resulting shape of all the
filters is displayed in the visualization area.
Low/High Gain, Freq
The low and high bands are 2nd-order shelving filters.
When any band's parameters are adjusted, a line
representing the EQ curve for that specific band is shown.
Mid 1/2 Gain, Freq, BW
The 2 mid-bands are 2nd-order parametric filters. When
any band's parameters are adjusted, a line representing
the EQ curve for that specific band is shown.
Low Cut
The low cut is a 4th-order filter. There are preset cut-off
points of "60 Hz", "80 Hz" and "120 Hz".
HARMONY | Compressor
The Harmony Compressor contains two modes depending
on what dynamic effect is desired. The compressor
visualization provides representation of the compressor
curve and real-time gain reduction amount.
Mode
The two modes for the compressor are "Compress" and
"Comp/Limit". The "Compress" mode is a variable knee
compressor. The compressor is triggered by RMS level
with automatic make-up gain. This makes it useful when
trying to get a smooth compressed sound. The
"Comp/Limit" mode is triggered by Peak Levels with
traditional attack/release controls.
Threshold/Ratio
These parameters operate like any standard compressor.
Threshold Parameter sets the input level when
compression will occur. Ratio Parameter determines the
amount of gain reduction when the threshold is triggered.
Make-up/Output Gain
When the mode is "Compress", the makeup gain is
automatic. However, an offset can be applied using the
Make-up Gain Parameter. When the mode is "Comp/Limit",
Output Gain can be added to the desired level.
Attack / Release
In both modes, the release parameter determines the
speed at which the compressor stops reducing levels. In
"Comp/Limit" mode, the Attack Parameter determines the
speed at which the compressor starts reducing levels.
Because of the variable knee modes with "Compress",
there is no Attack Parameter.
Knee
In "Compress" mode there are two knee modes. In "Hard"
mode, the compressor ratio is used immediately when the
threshold is reached. In "Soft" mode, the compressor ratio
is gradually reached as the level increases past the
threshold. "Soft" mode is ideal for a smooth compressor
sound.