iOS Musician Apps (68) Supported Technologies is Audio Unit (AU), Type is Tool

RhythmBud is a MIDI effect application that would transform incoming MIDI messages into the rhythmic pattern you will create on its editor.

ArpBud 2 is a MIDI Arpeggiator app where you can create unique arp patterns and be able to arpeggiate your favorite software or hardware synthesizers.

StepBud is a MIDI Sequencer with Audio Unit AUv3 plugin, Audiobus and Ableton Link.

ScaleBud is a music theory tool for composers, artists and learners. It has more than 40 most popular scales and counting.

LoopBud is a super simple yet very powerful MIDI recorder and looper.

DigiKeys is an AUv3 compatible MIDI sequencer plugin for AUM or other AUv3 compatible host applications.

"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.

ToneBoosters Spectrogram shows a real-time spectrogram of the incoming audio signal. The ToneBoosters Spectrogram app captures the microphone input and processes the signals in real time.

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

Visual Mixer is an audio unit plugin that puts the volume and pan controls for all your tracks together into one simple interface.

midiDREAMs is a MIDI AUv3 sequencer plugin designed to work like a classic analog-style modular sequencer with 16 virtual sliders and up to 64 steps per pattern.

Poly 2 is a generative sequencer that creates evolving patterns and melodies based on the power of polyrhythms.

Metronomics is not only a metronome, but a tool designed to help build a solid sense of time and rhythmic security.  It's a new kind of metronome -- use Metronomics to generate random patterns, sequenced grooves, or a combination of both to help you practice with more than just your typical click track.

With sEGments slicer/sampler app you can Import any loop/sample/audio file and find the best samples inside it, using the automatic transient detection or manually adding markers.

This is an AUv3 compatible Multi-Track Recorder plugin specifically designed for AUM and other DAW's that don't support audio recording capabilities.

AUVideoPlayer is a video player that works as an Audio Unit v3 plugin (AUv3) in your favorite DAW host apps such as AUM, Garageband, Cubasis or Audiobus.

MIDI Tape Recorder is an open source Audio Unit v3 plugin with a radically different approach towards MIDI recording.

cykle is an innovative, semi-generative melodic step sequencer for iOS that is based around the concept of sequencing individual musical parameters (such as pitch, velocity, length, transposition, etc.) independently, by way of decoupled sequencer lanes.

Wavescope is an Audio Unit Plugin effect that visualizes your audio in real-time.

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.