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SF-1 Stereo Filter

SF-1 Stereo Filter
SF-1 Stereo Filter by Numerical Audio is a Virtual Effect Audio Plugin and a Mobile Audio App for iOS. It functions as an Audio Units Plugin.
- iOS 9+
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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.
  • IAA.
  • AudioBus (Filter).


  • Tempo Sync.
  • CC Control.

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