# Comp 609 — Analog Classic Emulation

> Analog compressor emulation AUv3 plugin with advanced controls and parallel processing. (iPhone/iPad app by RRS, OOO.)

- Source: https://appshunter.io/ios/app/comp-609/id1514569444 (this page in markdown: same URL + `.md`)
- Developer: [RRS, OOO](https://appshunter.io/developer/1486125568)
- Category: Music, Utilities
- Price: Free with in-app purchases
- Rating: 4.80/5 from 25 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 21 MB
- Languages: American English
- Released: 2020-08-15
- Data updated: 2026-08-04
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/comp-609/id1514569444/reviews.md

## What is Comp 609?

Comp 609 AUv3 plug-in — comes as time-limited Demo-version for you to try. It gives you 5 minutes of Free play time. (You can reload the Comp 609 AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of Comp 609 AUv3 plug-in comes as In-App Purchase.

FEATURES:

• 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 comparison;
• 2x/4x/8x Upsampling;
• Macro controllers;
• Built-in Gain Match;
• Scalable GUI.

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;
• The 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. The Makeup 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 the 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 six 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.

## Key features

- Analog compressor emulation
- Adjustable attack, release, and ratio
- External sidechain with high-pass filter
- Multiple operation modes (M/S, Stereo, Mono)
- Parallel compression
- Oversampling and 64-bit processing
- Scalable GUI

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RRS Comp 609 Unlimited | $4.99 | one-time |


## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/comp-609/id1514569444/reviews.md

### 2/5 — ?

*2022-12-29*

seems to react very differend in stand alone and plugin mode.

### 5/5 — They’re all great.

*2022-10-14*

Get them all! Including the new synth! It kicks!

### 5/5 — Banging

*2022-08-20, version 2.0.0*

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

### 5/5 — Отлично!

*2022-06-02*

Очень хороший компрессор без экстремальных значений степени сжатия, подходит как для вокала, так и для инструменталка. Нормально работает и на подгруппах.

### 5/5 — Sonically Great!

*2021-12-12*

Don’t hesitate on this app, it works and sounded great..The interface is easy to use and very punchy as advertised.

### 4/5 — Bem interessante, funciona legal!

*2021-11-01*

Funciona redondo no iPad Air 4.
É bem preciso, faz seu papel com tranquilidade.
Não é pesado, comprime bem, não altera o timbre, gostei bastante. 
Até agora (2 semanas) não travou e nem apresentou nenhum problema.

### 5/5 — Not bad at all

*2020-11-07*

Good stuff you guys are making

### 5/5 — Charge More!

*2020-08-24, version 1.0.1*

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.

## Frequently asked questions about Comp 609

### What is Comp 609?

Comp 609 is an AUv3 audio effect plugin designed to emulate analog compressors. It offers detailed control over compression parameters and various operational modes for music production and audio engineering.

### How does the Comp 609 demo version work?

The demo version of Comp 609 provides 5 minutes of free play time. You can reload the plugin as many times as needed to re-access the demo period, allowing you to try its features extensively before purchasing the unlimited version.

### What are the key controls for compression in Comp 609?

Comp 609 features Threshold, Attack (1-6), Recovery/Release (40-2000ms), and Ratio (1.5:1 to 6:1) controls. It also includes an Analog Saturation toggle and a Comp. In switch to enable the compressor.

### Can Comp 609 be used for parallel compression?

Yes, Comp 609 supports parallel compression. The Mix control allows you to blend the processed signal with the original dry source, facilitating parallel compression techniques without complex routing within your DAW.

### What AUv3 host apps are compatible with Comp 609?

Comp 609 requires an AUv3-compatible host app to function as a plugin. Popular examples include GarageBand, Auria, AUM, and Cubasis, where Comp 609 will appear in the list of available audio unit extensions.

### What is the age rating for Comp 609?

Comp 609 has an age rating of 4+, making it suitable for a wide range of users. It is available on iPhone, iPad, and iPod.

### How often is Comp 609 updated?

Comp 609 was last updated on December 28, 2025, with version 3.0.1. This indicates a commitment to ongoing development and improvements for the plugin.

### What is the user sentiment for Comp 609?

Comp 609 has received positive user feedback, indicated by its high rating of 4.8 stars from 25 ratings. This suggests users generally find the plugin to be effective and valuable.

## Version history (last 5 releases)

### 3.0.1 — 2025-12-28

- Fixed parameters Automation bug.

If you like Comp 609 plug-in, please support us by rating this app in the App Store!

### 3.0.0 — 2025-12-22

- Implemented Gain Matching (GM) feature;
- Implemented Macro-Controllers feature;
- Implemented serial Groups chain feature;
- Implemented User Presets feature;
- Implemented SIMD optimization (experimental);
- Minor bug fixes and improvements.

### 2.5.0 — 2022-11-27

- Implemented GUI Scale on Pinch feature;
- Implemented Presets Drop-down Menu;
- Fixed parameters tweaking crash bug in some DAWs.

### 2.0.0 — 2021-11-27

- Implemented high resolution GUI;
- Implemented redesigned Toolbar;
- Implemented Undo/Redo functionality;
- Implemented A/B functionality;
- Implemented 2x/4x/8x-oversampling feature;
- Optimized GUI memory consumption;
- Minor bug fixes and improvements.

### 1.0.2 — 2020-10-25

- Fixed plug-in state save/restore bug on iPadOS 14.

## More apps by RRS, OOO

- [EQ560](https://appshunter.io/ios/app/eq560/id1486125569)
- [EQ-A](https://appshunter.io/ios/app/eq-a/id1492043981)
- [EQ550](https://appshunter.io/ios/app/eq550/id1507132030)
- [EQ550b](https://appshunter.io/ios/app/eq550b/id1507176549)
- [PolyIvoks Filter](https://appshunter.io/ios/app/polyivoks-filter/id1507649629)
- [RRS EQ3](https://appshunter.io/ios/app/rrs-eq3/id1507895144)

All apps by RRS, OOO: https://appshunter.io/developer/1486125568

## Related topics

[auv3 compressor](https://appshunter.io/ios/topics/auv3-compressor)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-04.*