iOS Musician Apps (46) Supported Technologies is Inter-App Audio (IAA), Instrument Sounds is Other

PixiTracker 1BIT is a simple and fun tool to quickly create musical sketches, chiptunes and experiments with TRUE 1-BIT SOUND (like on old microcomputers).
No musical knowledge required.

AnalogKit lets you play, share, and build synths and effects in an incredible digital playground.

The new Version 3 of dreamSTATE's multimedia iAlbum of ever-changing ambient music and urban ambient art can now be used by both Listeners and iMusicians

Turning your iPad in to a classic sounding theremin.

Ribbons is an extraordinarily fun and expressive musical instrument for iPad.

Esoteric Synth is a unusual generator of synthetic sound events. The synthesis is based on 5 oscillators which are intersected through an multiple amplitude modulation and multiple frequency modulation making  an high sound variability. This App is suitable to generate complex sound textures, glitches, noises, sound clouds, sound drones, point sounds and more.

PolyHarp is a virtual musical instrument and a thought experiment. It's a testbed for harmonic theory as well as a great multi touch simulator of the good old "idiot zither" you have in the attic.

Hexaglyphics is a 13-bit noise generator with an interface based on an original alphabet for hexadecimal values.

Slice your audio samples with ReSlice and create flexible musical atoms which can be triggered by MIDI notes or the touch of your fingers.

AutoPad is an app for musicians that allows you to play ambient pad loops.

Elsa is a retro style sampling keyboard with tempo based looping.

bs-16i is a 16 multi-timbral playback sampler. It supports SoundFont and DLS (Downloadable Sounds, and can be used for keyboard instrument, MIDI sound module, and MIDI player.

This synthesizer emulates male voice vowels in a unique way.

Musyc is a fun and innovative music application where touch turns into music.

Slice and sequence your loops with a matrix of markov-chain connections. Introduce order with the probability based coin-flipping pattern sequencer.

Chameleon is an AUv3 compatible sampler instrument plugin for your favourite DAW.

Backpack Studio allows you to easily create professional sounding,  studio quality recordings -  from anywhere in the world.

SoundScaper is an experimental sound mini lab for creating unusual soundscapes, atmospheric textures, drones, glitches and noises based on circuit bending principles.

With MusicStreamer you can stream sound to Chromecast or Airplay speakers.

Portable Music Production Studio : create beats, compose whole tracks, sample, record, sequence, perform, mix and arrange your own music.