Since Audio Damage started moving into the world of iOS we’ve seen some really cool apps arrive, and now we can add Filterstation2 to that list. Filterstation2 is the Audio Damage take on the classic serial / parallel / stereo dual filter topology, made famous (and some would say “indispensable”) by the Sherman Filterbank and its many clones. With twelve filter algorithms, an envelope follower with stereo sidechain input, a full FSU section for extra signal hacking, and an easy-to-use interface, Filterstation2 is a valuable addition to any producer’s toolkit.


  • Twelve different filter algorithms, including MS20 emulation and our classic 914 bandpass and Filterpod lowpass models.
  • VCA mode for tremolo and gate effects.
  • LFO with twelve different patterns, and both internal and tempo sync modes.
  • Envelope follower for dynamic control of filter frequency.
  • Serial, parallel, and true stereo operating modes.
  • Easy-to use interface for quick programming.
  • Vector-based resizable GUI. Use just the filter screen, slide the controls over it, or (in hosts that allow it) open up the whole UI.
  • Cross-platform XML-based preset manager; copy your desktop presets to the iOS version using Handoff, or share them with your friends and in forums.
  • Full PDF manual available at Support link.

Filterstation2 costs $4.99 on the app store now:

  • Does sound pretty good.
    Is it just me or would such effects really benefit from either MIDI Learn or some form of modulation from the AUv3 host? My first reflex with a filter is to drive the cutoff frequency through breath control (CC#2). But it doesn’t sound like Filterstation2 allows for direct modulation of the cutoff, apart from envelope following. Same applies to desktop plugins for delay and such.

    • DrüMünkey

      Load into AUM. Bottom of track open area where you can name track. In there is the mod routing. Tie any of FS2’s params to any cc or note you want.

      • Oh thank you! This really helps!
        Wasn’t entirely discoverable, but it does make a lot of sense once you get what’s going on. And it makes these AUv3 FX much more useful!

        • DrüMünkey

          Don’t even think about it, just buy Bram Bos’s Odessa set of midi AU’s… You can use things like his MIDI LFO (which is actually a set of 3 syncable LFO’s) to go totally nuts…

          Open AUM
          Put an instrument on track 1
          Put his LFO in the instrument slot of track 2 (not the FX slot)
          Go to bottom of track 1, open the mod area, choose midiLFO from track 2 as the midi source
          Match the midi CC and channel of the LFO in track 2 to the parameter you want to modify in track 1…

          Let the mayhem commence. 🙂

          • Nice explanation.

            Did immediately think of Rozeta when you pointed out the mod routing (the Cells one was my first attempt).
            My main approach is to use a controller to modulate most parameters (CC#2 with a wind controller or CC#74 with MPE). But what Bram gave us a few months ago is exactly the right tool for the job, in most other cases.
            There are still some plugins without control, like Italizer. But it does sound like most effects are easy enough to control in AUM. (Haven’t found a way to do the same thing in AB3.)

            Although, too bad Bram doesn’t believe in supporting older OS versions. My iPad 4 only runs iOS 10.
            On my iPhone 6s Plus, screen realestate is quite an issue with AUM and plugins. As devs say, it’s difficult to shrink to that size but… it’s conceivable that devs could start from an iPhone screen and add features for iPad versions. After all, some desktop plugins only have one big button.