# SF-1 Stereo Filter

> Dual stereo filter effect with expressive XY-Pad control for music production. (iPhone/iPad app by Kai Aras.)

- Source: https://appshunter.io/ios/app/sf-1-stereo-filter/id1461143028 (this page in markdown: same URL + `.md`)
- Developer: [Kai Aras](https://appshunter.io/developer/370820899)
- Category: Music, Music, Entertainment
- Price: $4.99 (on sale, was $9.99)
- Rating: 3.78/5 from 9 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 25 MB
- Languages: English
- Released: 2019-05-31
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/sf-1-stereo-filter/id1461143028/reviews.md

## What is SF?

SF-1 is a dual Stereo Filter Effect with a special focus on expressiveness. 

Built around 2 multimode filters with multiple filter models that can be configured to run in series, parallel or one per channel, SF-1 is true filtering powerhouse. 

It's built-in XY-Pad can be automated over a maximum of 4 bars which makes sequencing complex filter sweeps as easy as it could possibly be.

With Pad-Lock, the XY-Pad will always return to a set location after lifting a finger allowing for a wide range of play styles.

In addition, Pad-Engage/FX-Release only enables the effect while the XY-Pad is being touched and applies a tempo synced delay effect when lifting the finger making it a great option for expressive live performances. 

Overview:
- Dual Stereo Filter
- 2 Filter Models: SEM & Ladder
- 3 Filter Modes each: LP, HP, BP 
- Serial, Parallel or Channel Split Routing 
- Dual LFO with Tempo Sync
- Envelope Follower 
- XY-Pad with Automation
- Pad Lock and Pad-Engage/FX Release 

Connectivity:
- Standalone
- AUv3
- IAA
- AudioBus (Filter)

MIDI:
- Tempo Sync
- CC Control

## Key features

- Dual stereo filter
- Multiple filter models (SEM & Ladder)
- Serial, parallel, or channel split routing
- XY-Pad with automation
- Pad-Lock and Pad-Engage/FX Release
- Dual LFO with tempo sync
- Envelope follower

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/sf-1-stereo-filter/id1461143028/reviews.md

### 1/5 — Should have stuck with FD-1

*2020-06-27*

I saw where someone complained about the GarageBand crashing but I figured a year after the developer responded it would have been fixed by now. Even in Cubasis 3 it’s very glitchy. Is it worth hoping for fixes in future updates?

### 3/5 — Good but broken in bm3

*2020-05-08, version 1.0*

Great sounding filter however I have a bug on BeatMaker 3 which makes it unusable.. clicking / clipping sound regardless of parameters. 

Would be great to have wider lfo speed, and ability to have tempo sync selectable for each lfo, and a comb filter would be cool too !

### 5/5 — Lovely filter

*2020-05-02, version 1.0*

I really like SF-1.

A must have in anyone's kit.

### 4/5 — Great Filter

*2020-04-27*

Don’t think because it’s free it’s not good.  I reach for it before the toneboosters dual VCF quite often because I get on well with the big knobs on the interface.  It sounds great to my ears and easy to get some modulation going.  This was good enough to convince me to get the RE-1 tape unit, which is a beast.

The FD-1 is my favorite though.  That thing is endless rhythmic and textural experimentation.  Pure brilliance.

### 5/5 — Brilliant...⭐️⭐️⭐️⭐️⭐️

*2020-04-13, version 1.0*

Just get it, it's brilliant
Awesome filters, thank you !!

### 5/5 — Mutron 3

*2019-09-18*

Great sounding filters. Versatile. Envelope following that feels right when comparing to hardware envelope followed filters. If you're looking for a Mutron 3 on iOS, this is very close.

### 5/5 — Crashes GarageBand

*2019-06-03*

This AUv3 Crashes GarageBand instantly but it’s a great, useful filter. Since GarageBand doesn’t have the best automation options, this will hopefully be really useful with the built in automation.

**Developer response:** Hey there, 
sorry about that GarageBand crash, a fix will be available later this week.

### 5/5 — Excellent

*2019-05-31, version 1.0*

Another 10/10 for Kai Aras. You keep ‘em coming, I’ll keep on buying ‘em. This is really impressive.

## Frequently asked questions about SF

### What is SF-1 Stereo Filter?

SF-1 Stereo Filter is a dual stereo filter effect application designed for expressive audio manipulation. It offers multiple filter models, routing options, and an XY-Pad for detailed control over filter sweeps.

### What filter models are available in SF-1 Stereo Filter?

SF-1 Stereo Filter includes two main filter models: SEM and Ladder. Each model can be configured in Low Pass (LP), High Pass (HP), or Band Pass (BP) modes.

### How can I control the filters in SF-1 Stereo Filter?

You can control the filters using the built-in XY-Pad, which allows for automation over a maximum of 4 bars. Features like Pad-Lock and Pad-Engage/FX Release offer further expressive performance options.

### Does SF-1 Stereo Filter support external synchronization?

Yes, SF-1 Stereo Filter supports tempo sync for its dual LFO and MIDI connectivity. This allows it to synchronize with other devices or applications.

### What platforms is SF-1 Stereo Filter compatible with?

SF-1 Stereo Filter is designed for iPad and supports standalone operation, AUv3, IAA, and AudioBus (Filter).

### How much does SF-1 Stereo Filter cost?

SF-1 Stereo Filter is a paid application, priced at $4.99. There are no in-app purchases or subscriptions required.

### How often is SF-1 Stereo Filter updated?

SF-1 Stereo Filter was last updated on September 28, 2020. The latest version is 1.0.2.

### What is the user sentiment for SF-1 Stereo Filter?

Based on the available data, SF-1 Stereo Filter has a rating of 3.8 stars from 9 ratings. This suggests a generally positive but mixed reception from users.

## Version history (last 2 releases)

### 1.0.2 — 2020-09-28

- Fixed an issue where presets would not load properly when running on iOS14

### 1.0 — 2019-05-30

No release notes.

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## More apps by Kai Aras

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- [VOLT Synth](https://appshunter.io/ios/app/volt-synth/id1185984394)

All apps by Kai Aras: https://appshunter.io/developer/370820899

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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 2026-06-10.*