# RRS CL1 — Soviet Compressor

> Stereo and mono dynamic range compressor audio plugin with sonic coloration. (iPhone/iPad app by RRS, OOO.)

- Source: https://appshunter.io/ios/app/rrs-cl1/id1639305828 (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: 4.50/5 from 28 App Store ratings · 13 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 19 MB
- Languages: American English
- Released: 2022-08-18
- Data updated: 2026-08-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rrs-cl1/id1639305828/reviews.md

## What is RRS CL1?

RRS CL1 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 CL1 AUv3 plug-in as many times as you want, thereby you get the Demo period again and again.) Unlimited version of CL1 AUv3 plug-in comes as In-App Purchase.

CL1 is stereo and mono audio signal dynamic range compressor. CL1 compressor has distinctive sound allowing its usage not only for technical purpose of dynamic range compression but also for artistic sound coloration, which happens due to usage of saturation with even harmonics, dithering that gives effect of «air» and oversampling with non-linear phase response that gives effect of «depth».

CL1 compressor besides main dynamic range compression module also contains limiting module («limiter»), which allows controlling peaks passing through the compressor, mid-range equalizer module doing ISO-226 curves equalization and input signal or gain reduction VU-meter with lamp indicator for limiter operation control. CL1 compressor has adjustable high-pass filter for side-chain signal, also supports «parallel» compression and M/S operational mode.

FEATURES:

• Two different attack modes: «fast» and «slow»;
• Softness of compressor characteristics control;
• 6 operation modes: double mono, mono with external side-chain signal, mid channel, side channel, M/S, linked stereo;
• Mid-range equalizer and Side-chain signal high-pass filter;
• Pre- or Post-Limiter;
• Attack and Release times multiplier;
• Internal Dithering;
• Parallel compression;
• 8x oversampling and 64-bit floating point processing;
• External Side-chain.
• A/B comparison;
• 2x/4x/8x Upsampling;
• Macro controllers;
• Built-in Gain Match;
• Scalable GUI.

ATTACK MODE:

• In «Fast» mode when control signal reaches Threshold the compressor immediately and very fast starts to lower the signal level slowing down by exponential law;
• In «Slow» mode the compressor in the same situation starts gain reduction very slowly thus most attack of the signal passes through.

MID SCOOP:

• The built-in mid-frequencies equalizer is based on mid-frequency range equal loudness curves design and can be used as another tool to position instruments, with ability to highlight backside elements or to add a bit density to frontal elements and move them back at the same time.

CL1 developed on the basis of «МОЛОТ» compressor by Vladislav Goncharov.

To use CL1 as a plug-in, you need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis and more — CL1 will appear in the list of Audio Unit extensions for effect plug-ins in the host app.

## Key features

- Dynamic range compression
- Saturation with even harmonics
- Dithering for 'air' effect
- Limiting module for peak control
- Mid-range equalizer
- Parallel compression
- M/S operational mode

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RRS CL1 Unlimited | $4.99 | one-time |


## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/rrs-cl1/id1639305828/reviews.md

### 5/5 — Easily the best Compressor

*2025-10-04*

I have bought many compressors over the years. This one actually works well for anything. Awesome extra features like the mid scoop  really help with sculpting sounds. And it’s relatively quiet compared to all the others.

### 5/5 — Great addition to an audio toolbox.

*2025-08-01*

The Red Rock CL1 is the most versatile analog style compressor for iPadOS devices. Unlike the very digital compressors that are very versatile the CL1 has character and nice saturation characteristics on top of the versatile compression. So if you are looking for a great all around compressor plugin grab this AUV3.

### 3/5 — It’s wonderful but…

*2025-06-12*

How do you save presets? Am I missing something?

**Developer response:** Hi, this plug-in does not have its own preset saving feature; please use the DAW's (audio host's) preset saving functionality instead.

### 5/5 — My fav AUv3 comp

*2025-04-25, version 1.5.0*

Use this all the time, great on drums, master buss, anything really.  
Can be subtle or destructive… I end up using this way more than my hardware 1176!

### 5/5 — Unique Audio Texturing

*2025-01-03*

The processing and filtering this app can produce in creating a textual audio plane. To me it is like the sound version of light, a photon and a wave. Or perhaps an oscilloscope plotting the captured points in time on a line to create a wave

### 3/5 — Sounds good

*2024-08-06*

All of the Red Rock apps lack the ability to save custom presets for easy recall during mixing.  It’s kind of a bummer, honestly.

### 5/5 — Living on my master bus

*2023-08-28*

Its good, Rrs apps rock 🪄🪨

### 5/5 — I sincerely wish iOS could truly admire this Class A Grade true analog monster!

*2023-07-13*

Read the title. This is divinity. On behalf of the iOS platform, we sincerely pay our deepest respect, dear developer.

Love you.

### 5/5 — Company should be way more popular

*2023-01-06*

Don’t really know why this plugin company isn’t more popular than it is. The plugins sound excellent! I’m using them in GarageBand iOS. I bought several and do not regret it at all. They are true to the hardware they are emulating, and they have a very 3D/expensive quality to them in terms of sound. 5 stars!

### 5/5 — Smash it

*2022-11-29, version 1.5.0*

Really good compressor that can smash the granny out of breakbeats. I’m super happy with this one. It’s got mojo

## Frequently asked questions about RRS CL1

### How long can I use the RRS CL1 demo?

The RRS CL1 offers a time-limited demo version with 5 minutes of free play time. You can reload the plugin to restart the demo period as many times as needed.

### What is the price of the unlimited RRS CL1 version?

The unlimited version of the RRS CL1 AUv3 plugin is available as an in-app purchase. Specific pricing details can be found within the app's store listing.

### Does RRS CL1 have ads?

No, RRS CL1 does not contain advertisements. The app is free to download and use in its demo mode, with an optional in-app purchase for unlimited access.

### What devices is RRS CL1 compatible with?

RRS CL1 is compatible with iPhone, iPad, and iPod devices. It requires an AUv3-compatible host app to function as a plugin.

### What makes RRS CL1's sound distinctive?

The RRS CL1's distinctive sound comes from its use of saturation with even harmonics, dithering for an 'air' effect, and oversampling with non-linear phase response for 'depth'.

### What are the attack modes in RRS CL1?

RRS CL1 features two attack modes: 'fast' and 'slow'. The 'fast' mode reduces signal level immediately, while the 'slow' mode allows most of the initial attack to pass through.

### How often is RRS CL1 updated?

The latest version of RRS CL1 is 2.0.1, last updated on December 28, 2025. Updates typically address bug fixes and feature enhancements.

### What is the age rating for RRS CL1?

RRS CL1 has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

## Version history (last 5 releases)

### 2.0.1 — 2025-12-28

- Fixed parameters Automation bug.

If you like CL1 plug-in, please support us by rating this app in the App Store!

### 2.0.0 — 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.

### 1.5.0 — 2022-11-27

- Implemented GUI Scale on Pinch feature.

### 1.0.1 — 2022-10-11

- Fixed parameters tweaking crash bug in some DAWs;
- Implemented Presets Drop-down Menu.

### 1.0.0 — 2022-08-18

No release notes.

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## 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

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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 2026-08-20.*