iOS Musician Apps (28) Supported Technologies is Audiobus, Instrument Sounds is All-in-one

Synthecaster fuses elements from guitars and keyboards into a full range polyphonic instrument that is intuitive, accommodates a wide variety of playing styles, and generates an even wider variety of sounds.

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

Whether you're 2 or 92, NodeBeat will make you sound like a pro. Create your own music in a matter of minutes or listen to NodeBeat generate its own.

SK-51 is an all-in-one keyboard inspired by the Casio SK-1 (and his brother the SK-5), a 8-bit lo-fi keyboard from the 80’s, with sampling features and onboard drum machine.
Called the poor man's sampler at the time, this keyboard was a real instrument and has been used by many major artists such as Fatboy Slim, Portishead, Autechre and Nine Inch Nails.

Gestrument Pro takes everything we loved about Gestrument and improves on its original functionality while introducing a host of new features such as multi-touch, recordable automations, advanced scale editing and our unique system of highly tweakable modular generators that define the pitches and rhythms.

GarageBand is a DAW by Apple.

Thesys is a MIDI stepsequencer app, giving you control over just about all aspects of your favorite MIDI devices.

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.