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EFX is a 4 channel audio multi-effects processor for iPhone and iPad, that’s easy and intuitive to play, but also offers complex options to shape your sound and route the audio effects stream.

Connect EFX to an input source. You can use the device’s built in microphone, an external keyboard or guitar (iPad soundcard needed), your favorite iOS drum machine (*cough* Elastic Drums), or an iOS synthesizer via Inter-App Audio or Audiobus. Alternatively, you can import your own audiofiles and play them through up to 4 effects at once.

Examples of what to expect:

* Warm and juicy psychedelic swirls painted on the breasts of nude hippies.
* Shimmering alien landscapes, like in the big Hollywood movies.
* Garage door busting hardcore fuzz that will make actual blood come out of your ears.
* Washed out trendy fabric shoegaze ambience.
* Bleepy bloopy granularly engineered microsounds.

Or you know, you can even just run a chorus into a delay into a reverb, if you need bread and butter effects.

Save your favourite settings, and then recall them whenever you want, using either the user-friendly GUI, or via MIDI program change.

Screenshots iPad

Screenshots iPhone

FX select screen

XY pad screen

Vol screen


– Multi-effects app created by the developers of Elastic Drums
– 4 effect units with different routing options
– Choose one of 40 available stereo effects in each effect unit
– Broad range of different effects of the following categories: Modulation, Pitch, Distortion, Filter, Delay, Reverb, Others
– Additional master effects section with level meters, 3 band equalizer, compressor, stutter fx
– XY-Pad to easily control the most important effect values (Kaoss Pad style)
– Possibility to automate/record the XY-Pad tweaks (1,2,4,8 bars length)
– Automated tweaks and some effects (PingPong Delay) get played in sync via Ableton Link/Inter-App Audio
– Audiobus 3 support
– Inter-App Audio support
– Simple audio player to test the effects with audiofiles
– Tweak the most important parameters via Midi, Midi learn option
– Switch user-presets with Midi Program Change messages
– Save, load and share user presets


– iPad/iPhone (Universal) version: price: $9.99 / 10.99€

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