iOS Musician Apps (587) Supported Technologies is Audio Unit (AU)

Ratshack Reverb is a detailed model of that classic of classics, the Realistic Electronic Reverb. Now, you can have the sound of everyone's first analog delay unit, without ever having to change batteries!

SquareSynth is a hybrid analog/8bit style synthesizer. It takes features from the NES console, and the Commodore 64 personal computer.

So what is a midi echo? It is similar to the audio echo effect where copies of the original audio are repeated at regular time intervals but with some form of change (e.g. quieter). But unlike audio, midi is digital in nature (low resolution 8 bit mostly) and focused around the midi note on & off message used to control synths etc.

Epic 64-voice Virtual Analog / PCM iPad Synth. Inspired by the Digital Synths of the 80s and 90s.

This app is realtime voice changer that can work without headphones. When you speak, it will speak together with you making your voice to sound like alien robot.

Kleverb is an algorithmic reverb effect.

Electrogene is a low fidelity audio effect combining bit-crusher, modulation, saturation and filter with scope visualizer.

This is an AUv3 compatible processor friendly stereo pitch shifter plugin which can be used as a plugin with your favourite DAW such as Cubasis, Auria, Meteor or GarageBand.

This audio shredder does just what is says, it shreds incoming audio (usually strings or lengthy sustained chords) into bite size pieces, adds an envelope and passes through a filter of choice.

A different kind of drumsynth. Ruismaker Noir presents a hybrid approach between synthesized drums and rhythmic bass sounds - coming together in the fully integrated step sequencer.

AUv3 Midi sequence generator which generates musical evolving sequences  that you can further automate or modulate via midi.

PhaseThree is a detailed model of the MuTron Bi-Phase, with all the lovely sound of that unit (along with its foibles and quirks.)

"QuantiChord" is a MIDI effect that generates chords from incoming notes and quantizes the results to a pre-defined scale. It can be used as a standalone application or as an Audio Unit MIDI effect plug-in.

KB-1 is a an expressive virtual keyboard designed for a multitude of scenarios.

This is a AUv3 compatible audio effect which can be used as plugin with your favourite DAW such as Cubasis, Meteor, Auria or GarageBand.

Blue Mangoo Stereo Delay is designed to be the go-to app a for simple, musically tasteful delay effect.

This AUv3 plugin effect is a complex spectral saturation processor simulating a set of different analog gear in a new and unique way.

Aparillo is an advanced 16 voice FM synth tailored for complex sound structures , majestic motions, moving and evolving soundscapes and atmospheres that are perfect for film, TV or games.

NanoStudio 2 is a powerful music production environment for recording, synthesis, sampling, arranging, editing and mixing.

iMPC Pro 2 for iPhone fuses innovative song creation with the MPC workflow.