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Fruity compressor is a variable-knee compressor with built-in peak limiting.
Fruity compressor is a FruityLoops-exclusive VST plugin, based on fx:compressor, a part of Ultrafunk's Sonitus:fx R2 DirectShow / VST audio plug-in package. Other plug-ins included in the pack is fx:equalizer, fx:modulator, fx:phase, fx:reverb, fx:surround and fx:wahwah.
More information on Sonitus:fx plug-ins can be found at http://www.ultrafunk.com/products/sonitusfx/
Threshold
The Threshold parameter sets the dB level where the compressor
will kick in.
Range: 0.0 to -60.0 dB
The threshold should be adjusted according to the relative input level and the type of audio material.
Once the threshold level is reached, compression will start, reducing the gain of the input signal according to the current Ratio, Type, Attack and Release settings.
Ratio
Controls the amount of compression (gain reduction) that will be applied to the signal once the threshold level is reached.
Range: 0.4:1 to 30:1
Ratio denotes the difference in dB between input level and output level, i.e. how much the signal above threshold level will be compressed (or expanded, at ratios below 1:1).
For example, a ratio of 4:1 means that when the input level increases by 4dB, the output level of the signal above threshold will only increase by 1dB.
Gain
Controls the amount of make-up gain to be added or subtracted from the compressed output signal.
Range: 30.0 to -30.0 dB
The gain should be adjusted to normalize the signal amplitude after compression, or to control the amount of limiting.
Attack
Controls the time it takes to reach full compression once the threshold level has been reached.
Range: 0.0 to 400.0 ms
A fast attack setting means that compression will be more or less instant. Using a slower attack setting results in the compression being gradually increased, allowing for more variations in the signal than the fast setting.
Attack should be adjusted according to the nature of the audio material.
Release
The Release parameter sets the time the compressor takes to go back to an inactive state after the level has fallen below threshold.
Range: 1 to 4000 ms
Short release times will make the compression more flexible and able to adapt to the input signal, but can cause fast changes in gain that may sound displeasing to the ears. Longer release times produce a signal with a more even level and less distortion, but make it harder to maximize the overall compression because small variations in signal level will be ignored.
Type
This parameter controls the knee type and TCR.
Range: Hard, Medium, Vintage, Soft, Hard/R, Medium/R, Vintage/R, Soft/R
The knee determines the dB range above and below the threshold where the compression goes from 1:1 to the selected compression ratio.
A hard knee setting means that compression will take place immediately after the threshold level is reached, whereas a soft knee setting indicates that compression is gradually applied over a range in the signal.
The Vintage compression type emulates the compression curve found on some analog compressors, such as the classic Teletronix LA2A. The major difference is that the compression ratio is gradually reduced at a distance above threshold, slowly allowing the level to go back to a ratio of 1:1. This allows the loudest parts of the signal, such as drum beats and other peaks, to pass without being compressed as much as the rest of the signal. In this way, the Vintage compression type emulates electro-optical analog designs and can greatly enhance warmth and 'punch'.
The Vintage compression type also affects the TCR parameter, utilizing a different release time adjustment method.
The /R types enable TCR (Transient Controlled Release), a special algorithm that automatically adjusts the release time in real-time to avoid fast compression changes. The release time is adjusted in relation to the current Release parameter setting. Enabling TCR can have positive effects on some types of audio material, and help to reduce "pumping and breathing", while increasing the overall loudness of the signal.