The final step repeats everything to get closer to an satisfactory setting. When these settings are optimized, the fine tuning of attack and release is necessary to get closer to the compensation of the original setting. As soon as the threshold setting results in an improvement, fine tuning of GR-limit and threshold should be the next step. Now, the threshold control is used to find the range of the over-compression. The best way to do this is to start with an expansion ratio of 1.5 and a GR-limit setting of 10 dB. To compensate an overcompression the original compression parameters will be unknown in almost all cases and have to be figured out. While the expander is supposed to suppress noise and other interferences at low levels and leave the levels above this noise floor unchanged, the de-compressor is used to reverse a prior compressor setting. Only the threshold setting is entirely different. Stereo Direction Mixer with M/S Equalizerīoth applications are not really different. If this would not be limited to an appropriate value, the gain would constantly raise down to a level below - 80 dB which would result in extremely high noise values at low input levels. With the pump-up compression mode, this control determines the maximum possible gain. With de-compressor mode, it makes possible to determine the level range of the de-compression precisely. The GR-limit control is very important for both the pump-up compressor mode and the de-compressor mode. The law of the control pot is double logarithmic, which allows precise adjustment of the small values that are mainly necessary. The range from 3 dB to 50 dB (full range, no limitation) allows all settings that are needed for the different operation modes. The GR-LIMIT control determines that maximum gain (with compressor mode) or gain reduction (with expander/de-compressor mode). Turning the ratio to the right causes compression while the range to the left causes expansion or de-compression, respectively. The inactive, 1 : 1 setting is at the center position. The Ratio control determines the operation mode. The range of the Threshold control that determines the upper limit of the regulation, reaches from - 40 dB to + 15 dB, which is sufficient for any application. The release control ranges from 0.1 sec to 2.5 sec the range of the attack control is 0.2 ms to 10 ms. However, with compression, the attack time is still the reaction time on a higher input level, but, in difference to expander mode, the output level is reduced in this case. This can be a bit confusing depending on the point of view, attack and release change their functions between expander mode and pump up compressor mode. The attack control determines the reaction delay of the regulation when the input level is increased, while the release control determines the reaction time when the level drops down. The Attack and Release controls of the section are not different from the corresponding compressor controls however, the different regulation characteristics has to be considered. Above theshold the signal remains unchanged. In difference to compressor and limiter, the treshold is the upper limit for the regulation and not the lower limit. Independent of the operation mode, the regulation is always downwards, which means that levels above threshold do not cause any regulation and the gain or gain reduction increases when the level below threshold drops down. The section has controls for Threshold, Attack, Release, Ratio and a GR-Limit control.
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