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

Combo Organ Model V is a musical keyboard app for iPad/iPhone/iPod touch that simulates the electric transistor organ, is called a Combo Organ. It was a big success in the 1960s.

SynthQ is a subtractive synthesizer with a customizable interface.

MonoStereo Synthesizer is a free full-featured analog mono synth with oscillator panning.

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.

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

This fully featured monophonic synthesizer can create a huge variety of sounds. Fat basses, stabby leads, glitchy noises, old style chip tune sounds (including arpeggios), weird percussion, you name it.

SynthMaster Player for iPad is the MOBILE PLAYER VERSION of the award winning SynthMaster software synthesizer.

Arpeggist is a MIDI Note arpeggiator with a very flexible step matrix editor for programming and a unique “rolling dice” random arpeggio generator.

ToyTone is simple synthesizer. Select waveform, and move the slider. Tap the pad at bottom, you can play.

Lorentz is not only a live-oriented analog modeling synthesizer, but also has a resonator that makes metallic and aggressive sounds.

Mimicking the layout of Hohner's iconic piano accordions, this intuitive virtual accordion is easy to play and sounds exactly like the real instrument.

Mimicking the layout of Hohner's iconic chromatic button accordions (CBA), both B-System (Bayan) and C-System, this intuitive virtual accordion is easy to play and sounds exactly like the real instrument.

For all creatures in the ocean of sound - Sonic textures from other worlds, Analog signature sounds,  Cut-through-the-mix leads and silkily smooth pads.

CHAiOS SYNTH 2 is a synthesizer/melody generator that creates unique melodies with just one tap.

KQ MiniSynth is a polyphonic modular synthesizer.

MegaCurtisBig uses an unusual hybrid of wavetable and granular synthesis to create tones and timbres quite apart from the standard FM or subtractive synthesis fare.

This is a synthesizer designed specifically for making Dubstep, DNB and EDM lead bass/synth.

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.

Mersenne is a melodic percussion synthesizer that combines two FM synthesis modules, a noise generator and a resonator.

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