SF-1 Stereo Filter 4+

Kai Aras

    • 3.8 • 9 Ratings
    • $7.99

iPad Screenshots


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.

- 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

- Standalone
- AUv3
- AudioBus (Filter)

- Tempo Sync
- CC Control

What’s New

Version 1.0.2

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

Ratings and Reviews

3.8 out of 5
9 Ratings

9 Ratings

tesserat ,

Great Filter

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.

B-dub1111 ,

Crashes GarageBand

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.

Benjamin Virgo' ,

Should have stuck with FD-1

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?

App Privacy

The developer, Kai Aras, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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