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CONTROL CHARACTERISTICS
The control characteristics of the mpressor offer a great spectrum of settings without generating any unwanted artifacts or noises. Even very fast attack and release settings can be made without any problems. Already known from the alpha compressor, the Auto Fast feature is the guarantee of a very fast but undistorted gain reduction: If this function is activated, the attack time will automatically become shorter on input signals with fast rising levels and intense changes of dynamics.

The novel Anti Log function generates an anti-logarithmic progress of the release curve. The release time will at first become slower when there is an ample increase of compression. As soon as the input signal returns to a noticeably lower amount, the release time will be shortened automatically. Depending on the other settings, compression will become much more audible than before as a result. This feature can be used to achieve BPM-dependent dynamic effects, manipulate the spatial parts of a reverb effect return, or process single sources such as vocals or bass.


GAIN REDUCTION LIMITER
Another specialty of the mpressor is its limiter for the control voltage. With it, one can set the maximum amount of gain reduction that will not be exceeded as long as the function is active. Normally the threshold and ratio parameters determine the amount of gain reduction which is adapted to the input signal in order to reduce the loudest parts as desired.

If the limiter is set to a maximum reduction value, threshold and ratio can have completely different settings without changing the maximum gain reduction. In this manner, very special variations of control characteristics can be achieved, e.g. applying a strong amount of compression while preserving the dynamics of loud passages at the same time.

Combining the Gain Reduction Limiter with the external sidechain transforms the mpressor into a true ducker. In this application, the music will automatically be turned down when a voice sets in (or just the other way round). Another option is to apply upward compression that only raises the volume of the quieter parts without changing the actual dynamics at all.


EXTERNAL SIDECHAIN
The mpressor provides a switchable external sidechain input per channel. Once it is activated, the compressor reacts to the fed in signals and opens up an enormous variety of additional potentials. A typical application is frequency-dependent compression, where an additional equalizer is used to give certain frequencies a stronger or weaker influence on the overall compression.

True ducking effects are also possible as well as very cool groovy sounds, e.g. controlling a stable synth pad with a drum beat fed into the sidechain. The combination of the Anti Log and Gain Reduction Limiter functions result in very unusual effects that sound like an inverted gate: the loud signals are reduced intensely while the quieter parts come in front more obviously.


AUDIO FILTER
In order to add flexible sonic stamps to compressed signal, there is a Niveau Filter placed after the compressor section which has been designed in the style of the audio EQ of the alpha compressor.

It also boosts the high frequencies beyond a selectable center frequency and cuts the low frequencies at the same time (or, depending on the individual setting, just the other way round). But according to the intended use of the mpressor, we have made the possible settings more extreme for more striking and dramatic effects.

Only two controllers produce a great variety of different sounds that could not be generated by using standard parametric equalizers. The combination of this filter and the special control characteristics enable the mpressor to give a totally new character to the original signal that can vitally enhance a whole production.


100% DISCRETE
Here is an old elysia saying: If you want to make it right, make it discrete! Of course this is also true of the mpressor, as the combination of very extreme control characteristics and an absolutely convincing quality of sound can only be achieved by using discrete circuitry. Therefore all signal stages were designed to use single transistors, resistors and capacitors, so each of the stages could be perfectly matched to its specific task as an important side effect.

Many parts of the circuitry do without negative feedback, and the complete unit works in constant class-A mode in order to ensure the best audio quality in any situation. Even the sidechain and the power supply are built with the exclusive use of single transistors, resulting in considerably lower noise compared to conventional ICs.
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