iOS Musician Apps (503) Supported Technologies is Inter-App Audio (IAA)

The Quinta Pitch Machine is more than your standard octave in that it not only gives you notes an octave up and an octave down, but also gives you a fifth up.

Auria is a mobile music production system designed from the ground up for the iPad.

The concert quality piano app.

Colossus Piano sets a new standard in terms of realism, detail and overall quality of piano sounds on your iPad, iPhone and iPod touch.

Arctic Pro Synthesizer / Vocoder is a modern subtractive synthesizer.

Zen Musical Harmonizer ZMH-1 is a vocal/instrument harmonizer app.

Mic Room FREE is a microphone modeling app for your iPhone or iPad.

VoxSyn turns your voice into the flexible vocal sound generator ever.

Built for Live performance and hands free use, Quantiloop recreates the simplicity of a hardware loop pedal in an iOS app.

Play along or record your own songs with the best studio drummer in the world.

Real live horns for your songs, played by the first call horn section in The Netherlands, the Jayhorns.

Musk MIDI Keyboard is an expandable MIDI keyboard.

Created in collaboration with the tone gurus at MESA Engineering, AmpliTube MESA/Boogie gives you a full spread of gear that represents the breadth and versatility of the many faces of MESA/Boogie.

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.

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

The concert quality piano app.

Real time vocal processor + recording app.

S-Modular is a semi modular synthesizer for your iPad.

Annoydio has a grid of pads which you can assign, manipulate, and play sounds.

With Drum Loops HD 2 (as with Drum Loops HD) you have a live drummer right in your back pocket.