iOS Musician Apps (61) Supported Technologies is Audio Unit (AU), Type is Tool

The WoodStepper is a sequencer having both audio and midi out.

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

Now available as an Audio Unit extension (AUv3) allowing it to act as a powerful MIDI sequencer and clip launcher.

MIDI Strummer is an AUv3 plugin designed to simulate guitar strumming and picking techniques. It can used to generate MIDI note data which can be sent to either an external synth of choice or the internal soundfont engine.

Get audio visuals with your AUv3 host or the standalone app. Scope uses a two-axis graph to give a visual representation of a waveform over time, with the horizontal axis representing time and the vertical axis representing the amplitude.

Harmonizr is a vocal harmonizer offering a unique and fun user interface.

7Xwave - a 7 track sample sequencer with synthesizer & animatable modulation features.

auSCOPE X is the Smart Audio Oscilloscope that lets you see your sound. Its Two Channel Design lets you look at stereo audio waveforms in real time in pixel-accurate resolution.

Session Notes AU provides access to a custom-tailored notes database directly within your Digital Audio Workstation (DAW).

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

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

Does the World need another MIDI Monitor? We thought so, and it's free, so you have nothing to lose to add this handy little utility to your app collection.

"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.

Tube AU is a web video player audio unit plugin.

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

MIDISpy - MIDI Monitor. A handy little utility for monitoring MIDI connectivity.

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

Binaural Location goes beyond the simple pan control; it allows you to place your audio at a specific location anywhere in a virtual space around the listener. The location of the L and R control points on the screen controls the location of two virtual speakers. Based on the angle and distance from the speakers to the listener's ears, the app creates a realistic impression that the sound is actually coming from the specific location of the L and R points.

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.

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.