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 FD-1 Filter Delay by Numerical Audio is a Virtual Effect Audio Plugin and a Mobile Audio App. It functions as an Audio Units Plugin.
FD-1 Filter Delay
Product FD-1 Filter Delay
Developer Numerical Audio
Price (MSRP)
Type / Tags DelayFilter Delay
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
  Download Released
System Requirements
iOS 11+
Max. 6 items
Latest Version Changes [view all]

FD-1 is a Semi-Modular Effect Plugin including dedicated Filter, Delay and Modulation sections.

At it's core, FD-1 is designed to create filter rythms and grooves by first sending the signal through a modulated filter section before feeding it to a delay stage but it goes much further than that.

Built-in Step Sequencer and Low Frequency Oscillator serve as modulation sources and are ideal for creating rythmic filter sequences either free running or tempo-synced to a host application.

However, due it's semi modular nature, not just filter cutoff but every control within FD-1 can be a modulation target allowing for an increased range effects and combinations ranging from Chorus and Flanger type effects over Analog and Tape Style echos to complex Stutter and Repeat effects.


  • VA Multi Mode Filter with 2 & 4 Pole options.
  • Digital Stereo Delay with Tempo Sync and Time Range Control.
  • Analog Style Step Sequencer.
  • Low Frequency Oscillator.
  • Easy to use Mod Matrix.
  • Input Low-Cut and Drive Controls.
  • Individual Return Levels for Filter and Delay.


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


  • Tempo Sync.
  • CC Control.


  • iOS11+.
  • iPad 4th generation or newer.
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