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EQ550 (iOS)

EQ550 (iOS)

Really cool sounding.Camilo Calvo (Columbia, App Store)

Comp 609 (iOS) v2.0.0
Comp 609 (iOS)

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. 


  • 6 Attack, 9 Recovery (Release) and 5 Ratio selections;
  • External Sidechain and Sidechain signal High-pass filter;
  • 6 operation Modes: M/S, Mid-channel, Side-channel, Mono with Right-channel as Sidechain signal, 2-Mono, linked Stereo (or Mono);
  • Parallel compression;
  • 8x Oversampling and 64-bit floating point processing;
  • Undo/Redo;
  • A/B.

Compressor Section

  • 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.

Master Section

  • 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;
  • Mode — compressor can operate in 6 modes: M/S, Mid-channel, Side-channel, Mono with Right-channel as Sidechain signal, 2-Mono, linked Stereo (or Mono). This switch determines the active mode.

To use Comp 609 as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — Comp 609 will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

Reviews and Ratings

Charge More!
This App is insanely good. It is exactly what I needed - it reacts and sounds like a real life studio rack compressor. And so easy to use! Thank you.Jamie Mal (UK, App Store)

Not bad at all
Good stuff you guys are making.IamShazamm (USA, App Store)

Nice one.
RRS make great plugins.jolico (forum.audiobus.us)

I’ve tons of compressor but RRS apps are must buy.
It gives some color to the mix definitelyCharlesalbert (forum.audiobus.us)

Just purchased. Its excellent. I literally emailed the devs 2 weeks ago asking if they could do a compressor app. Never heard back and wow surprise. All RRS plugins are very good. Cheers Whitestormbeats (forum.audiobus.us)

This is exactly how a compressor should sound on a Master or Bus channel. Sounds very analogue and real. Smooths the peaks and retains the transients. Keeps my mix open. Adds glue to the mix. RRS are for sure the “Waves plugins” of the iOS platform. Well done to the devs.stormbeats (forum.audiobus.us)

I have access to the Neve hardware unit, and this sounds pretty comparable! Not bad for a $5 plugin.shinyisshiny (forum.audiobus.us)

Sonically Great!
Don’t hesitate on this app, it works and sounded great. The interface is easy to use and very punchy as advertised.Jhomsombath (USA, App Store)

They're all great
Get them all!anickt (USA, App Store)

Очень хороший компрессор без экстремальных значений степени сжатия, подходит как для вокала, так и для инструменталки. Нормально работает и на подгруппах.rusbroadcast (Russia, AppStore)

I’ve wanted a hardware Neve for a long time. The £3000 price tag is a real put off though. £5 are you kidding me what a bargain. It sounds great and has the correct character 90% of the way there for 1% of the price er that’s a bargain which ever way you cut it.69reasons (UK, AppStore)