The Crest setting affects the behaviour of the ac/dc converter.
With Weight in the center click position, both channels determine the compressor
equally. All other positions force the compressor to operate controlled by either
the M or the S channels.
At center, both channels are precisely linked. No modulation of the stereo base
width takes place by the compression. In all other positions, the linking is
reduced or even switched completely off. This may cause nice effects, since the
compression will not only affect the level but also the stereo base width, which
is modulated by the compression. In most cases, such settings will result in
a strange behavior of the stereo panorama, like shifting instruments that are
not located in the center more to left or to the right by the compression.
Please treat this control carefully and check for these effects!
The Envelope Control can reduce the distortion of low frequency signals with short release time settings that is based on physical side effects. All frequencies below the scale setting of the envelope control are affected by this function.
The HUE filter is located in the internal side chain and affects the mid & range.
At center, the filter is off. Turning to the right reduces the mid/high range
which will result in less compression of the mid/high range and vice versa if
you turn the pot to the left. You will get a more or less mid/high frequencies
in the compressed output signal, depending on the position of the pot and the
switch that determines the frequency range under regulation.
Since the compressor regulation is proportional to the spectral density of
the input level, the effect of the Hue filter depends on the levels in the mid/high
range (high mid/high level = more effect and vice versa).
Autogain is an analog computation circuitry that compensates the loss of gain caused by the setting of the compressor. The calculation is based on the settings of threshold, ratio and attack.
Side Chain Insert
The Side Chain Insert allows to integrate external equalizers and filters into the regulation loop of the compressor. These units can modify the frequency response of the regulation and therefore the entire behaviour of the compressor.
The format of the side chain insert is identical to the operation format of
OpMode M/S -> S-C-Ins, M/S
OpMode L/R -> S-C-Ins, L/R
Like audio inputs and outputs, the side chain insert is electronically balanced and can handle levels of + 30 dBu.
The compressor can be used in M/S Mode or Stereo Mode. The mode is determined
by the combination the format of the input signal and the position of the INP-MS
switch (pos 4.):
Input L/R - INP-MS not pressed -> M/S Mode
Input M/S - INP-MS pressed -> M/S Mode
Input L/R - INP-MS pressed -> L/R Mode
Input M/S - INP-MS not pressed -> L/R Mode
The OUT-MS swtich (pos 5.) determines only the format of the output, not the
With Stereo Mode some functions behave differently:
Weight -> regulates between L and R instead of M and W
Base Enhancement -> MUST BE SET TO OFF
elliptic EQ -> MUST BE SET TO OFF
Balance -> controls the linking of L and R instead of M and S
With the factory standard, the bypass switch is a hard bypass that disables or
enables the entire module. If the module is used within an M/S processing chain
this would cause a change in the format depending on the bypass switch.
Jumper settings in the module make it possible to alter the function the bypass
switch to 'compressor only'. With this setting, the matrix stage are always on
but the compressor is switches by the bypass switch. The INP-MS and OUT-MS switches
are working in both settings.