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Numerical Audio releases SF-1 Stereo Filter for iOS with Intro Offer

Numerical Audio

Numerical Audio has released SF-1 Stereo Filter, a filter effect for iOS.

Built around 2 multimode filters that can be configured to run in series, parallel or one per channel, dual tempo sync-able LFOs, Envelope Follower, XY-Pad and Motion Sequencing SF-1 is true filtering powerhouse.

Its built-in XY-Pad takes a prominent place and allows both axis to be mapped to any parameter, Motion Sequencing of 1 to 8 bars is designed to make sequencing complex filter sweeps as easy as it could possibly be.

Since the filters are designed to operate in true stereo, SF-1 can be a performance effect when used on a master bus, especially in combination with the XY-Pad and it's different play-modes.

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 an option for expressive live performances.


  • Dual Stereo Filter.
  • 2 Filter Models: SEM & Transistor 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 / Latch.
  • Pad-Engage/FX Release for Smooth FX Trails.


  • Standalone.
  • AUv3.
  • IAA.
  • AudioBus (Filter).

Price: $4.99 from the Apple App Store (Intro Offer, ends June 3rd).



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