iOS Musician Apps (28) Supported Technologies is Audio Unit (AU), Type is Host

A simple free music player that allows you to play music files while playing effectors that support Audio Units Extension (AUv3 plugin) format.

n-Track Studio 8 turns your iPhone, iPad or iPod touch into a complete recording studio.

Helium is a lightweight AUv3 MIDI sequencer plugin designed specifically for AUM. It supports up to 16 tracks of unlimited length with the ability to direct output to 16 channels on up to 16 MIDI output ports.

This app is a portable multitrack audio and MIDI recording studio featuring virtual instruments, editing with unlimited undo/redo, mixing, real-time effects, automation and much more!

Compose your own music for free with Dorico. Create beautiful music notation for one or two instruments quickly and easily with the on-screen keyboard, drum pads and fretboard. Play back instantly with the included sounds and shape the performance with powerful MIDI editing tools. When your piece is finished, share it as PDF, audio or MusicXML, or print directly to your AirPrint-enabled printer.

MIDIculous is the most feature-rich music learning software for students and teachers. At its core it is a high quality MIDI File Player where you can use the stock General MIDI soundest or you can use AUv3 apps already installed on your iPad.