Classic British Compressor.

Comp 609 Dynamics processor 

Red Rock Sound Comp 609 recreates sound of the hardware compressor from ’70s. This dynamics processor packs a recognizable musical punch heard on countless records around the world.

Latest Versions

AUv3 version 2.0.5 (Sep 19, 2022)
VST2 version 2.0.5 (Sep 19, 2022)
VST3 version 2.0.5 (Sep 19, 2022)

VST2 version 2.0.3 (May 18, 2022)
VST3 version 1.0.3 (Sep 20, 2022)



  • Threshold determines how much compression will occur. When the input signal exceeds the Threshold level, the compressor engages. A smaller value results in more compression. The available range is from -20 dBu to +12 dBu;

  • Attack determines how fast limiting will engage when the signal exceeds the limiter Threshold. The available values is from 1 to 6;

  • Recovery (release) is the time it takes for the compressor to stop processing after the signal drops below the Threshold value. The available values are 40, 80, 100, 400, 600, 800, 1000, 1500, 2000 ms;

  • Ratio — this control determines the compressor ratio. The available values are 1.5:1, 2:1, 3:1, 4:1 and 6:1;

  • Sat. On — this toggle switch enables the Analog Saturation. The saturation has no effect unless this switch is in the «On» (down) position.


  • SC-Filter — the Sidechain Filter controls the cutoff frequency of a low-cut filter on the compressor control signal sidechain. The available range is 30 Hz to 240 Hz and Off.

  • Input Gain controls the signal input level to the plug-in;

  • Makeup control increases the signal level out of the compressor to compensate for reduced levels as a result of compression. The available range is -20 dB to +20 dB. This control does not affect the amount of compression;

  • Mix — the output balance between the signal processed by the plug-in and the original dry source signal can be adjusted with Mix control. Mix facilitates parallel compression techniques without having to create additional routings in the DAW;

  • Comp. In — this toggle switch enables the compressor. The compressor has no effect unless this switch is in the «In» (down) position;

  • SC — this button activates Sidechain (№3+№4) inputs. A compressor with a Sidechain input controls gain from Main Inputs (№1+№2) to outputs based on the level of the signal of the Sidechain inputs;

  • Mode — compressor can operate in 4 modes: Stereo, Mid-channel, Side-channel, 2-Mono. This switch determines the active mode;

  • HQ — this button activates 4x-oversampling (note that when the HQ mode is on, CPU will be loaded more than usual).


- 6 Attack, 9 Recovery (Release) and 5 Ratio selections;
- External Sidechain and Sidechain signal High-pass filter;
- 4 operation Modes: Stereo, Mid-channel, Side-channel, 2-Mono;
- Parallel compression;
- HQ-mode (4x-oversampling) and 64-bit floating point processing.

- Double click — reset to default value;
- Shift — reduce knob/fader sensitivity.