iOS Musician Apps (128) Supported Technologies is Inter-App Audio (IAA), Instrument Sounds is Keyboards

A matrix-controlled arpeggiator designed to play with your thumbs.

Shape is a polyphonic synthesiser allowing the user to draw the shape of the oscillator waveform.

This intuitive virtual instrument features a super responsive  fingerboard that plays and sounds like the traditional instrument in the most common two-row tunings of B/C, C#/D, and D/G, as well as an extended B/C+ layout with four chromatic buttons on a partial third row.

GSi VB3m simulates the famous american tonewheel organ better known as the Hammond Organ B3.

Syntronik is IK’s cutting-edge synthesizer that features the sound of the most iconic machines to ever grace the planet.

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

Phase84 is a phase distortion synthesizer.

Arctic Pro Synthesizer / Vocoder is a modern subtractive synthesizer.

Dazibao is a polyphonic synthesizer programmed by an innovative interface : you create several tones, then you arrange them on several time lines.

Vox Unit is a vocoder. You speak in the microphone, you play on the keyboard, and choir and vocal effects are produced.

SpringSound is a physical-modeling audio synthesizer that produces sounds by simulating interactions and vibrations of a set of activators and masses connected to springs.

Free iPad instrument featuring the classic sounds of famous 80s FM Synthesizers.

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

LayR is a polyphonic, multi-timbral synthesizer for iPad and iPhone, delivering up to 256 voices of rich, multi-layered and textured sounds.

Just a Toy Synthesizer. Included: 2 Oscillators, LPF, Delay effector, Ribbon controller.

This app reproduces the functionality of Casio’s best-selling CZ-series models, such as the CZ-101 (first released in 1984), and also includes new functions.

Mellowsound is an emulation of a legendary instrument, a keyboard sampler from the 60s used by many famous artists like the Beatles, David Bowie, Radiohead and many others, this mythic instrument is called The Mellotron.

A Simple Ad-Free Piano-like Musical Keyboard. Easy to Play, Good Response and Small Application Size. Just Play the Instrument. The app doesn't use sampled real sounds but use FM synthesis. It sounds like piano though it's false.

DRC is a virtual analog polyphonic synthesizer that recreates the characteristic sound of an analog synthesizer.

Ravenscroft Grand is a piano sampler.