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Magix Audio cleaning lab 2014 Manual

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Because of the feedback topology, the maximum gain reduction is usually lower than
VCA devices with forwards detection, usually 20 dB. This way, there is almost
always a level matching amplifier in the feedback loop. The "drive" controller of the
AM-Track regulates the feedback amplification here. This can be so high that the
detector may become saturated by a loud input signal, resulting in signal peaks being
swallowed up. Simultaneously, the setting becomes more intense as quieter signals
also start reaching the threshold. You can creatively implement this according to the
situation to create complex signal compression which doesn't much sound like
dynamic compression due to the transients that slip through and release at high
"drive" levels.
The stated release of the signal, technically known as a ratio reduction, is also caused
by the centerpiece of the circuitry: the FET. Level reduction works entirely as a
function of its characteristic curve, resulting from the non-linear behavior of this
element. The FET virtually comprises part of the input resistance of the compressor
circuit. As a result, the input/output response curve does not create a plateau when
"drive" is high, which would be the case for a reference line featuring a high ratio or
even limiting. A saturated FET may no longer complete the job it was marked out to
do, i.e. to keep its output at low Ohmic values. Once again, signal peaks pass through
the entire circuit unaffected, but the average level could be severely compressed.
From a technical point of view, the control process appears incomplete, but sounds
pleasantly open and airy depending on its application.
The entire detection is dependent on the spectral balance in the virtual AM-track
circuit, the highs are automatically compressed less so that even extreme settings
sound less flat and more lively.
It's the same story with deep bass. On closer listening, you'll find that with strong
compression the signal still retains its power which would otherwise be lost if the
envelope were to follow shortly afterwards.
"Vintage" mode has another feature to offer: At the output of the compressor in the
signal path, an emulation of a transformer-coupled matching-level amplifier can be
found. This contributes to some subtle, non-linear distortions at high levels, but is
very much frequency-dependent.
VCA Mode
In VCA mode, the parameter selection and the circuitry design
correspond to a modern compressor with a VCA element as the control
circuit and a forward automatic gain control in the detector section
("feed-forward design", i.e. the controlling signal for level reduction is
taken from the input signal).
The typical basic sound for this category is accurate, largely neutral and, in relation to
the adjustable parameters, easily predictable.
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