iOS Musician Apps (344) Supported Technologies is Audiobus, Type is Instrument

Metronome for iPhone, is also an intuitive and powerful groove box / drum machine and tempo practice tool.

Load any MIDI file and sound library (a small General MIDI sound font is included). Play midi files with additional features.

Brazilian Drum Machine is a complete brazilian rhythm section in your device.

SynthQ is a subtractive synthesizer with a customizable interface.

Nave is a wavetable synthesizer.

Uber Synth is a polyphonic multi-timbral FM synthesizer that runs on any iOS device.

An app that can also be used stand-alone with a cool built-in FM synth and sound space surface 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.

Syntorial is a synthesizer training app, that will teach you how to program synth patches by ear.

Voice bot is a real time channel vocoder.

LoAdKer is a novel rhythm event generator that is based on fractal sequences.

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

Celtic Sounds is a fully transposable MIDI sound module with five traditional Irish musical instruments.

Steps by Reactable is a small yet powerful MIDI sequencer that allows you to create complex rhythmic patterns in a surprising new way.

DrumJam is a whole new world of percussion and drums for the iPad, iPhone and iPod touch.

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.

SDS-x is a "nine pads" style drum module that lets you easily use samples alongside your drum kit.

Chordbot is a songwriting tool / electronic backup band that lets you create and play complex chord progressions in different arrangements easily. Just add some chords, select a comping style and hit play.

With a library of editable patterns, loops, and fills, Drum Session is a very fast, simple way to put together a complete drum track.

RMX-1000 for iPad is a tactile iPad app that lets you add high-quality FX to tracks in your iTunes library.