Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.Download on the App Store
Audiobus is the app that makes the rest of your setup better.
Earhoof - New App with AB & IAA
From their website
Earhoof is a musical instrument which combines a powerful sound generating engine with an innovative rhythmic playback mechanism. Simply by holding the surface, complex rhythms trigger and seamlessly transition, while the sounds the internal sequencer generates continuously vary as you glide your fingers across your device. Even though Earhoof is easy to play, its flexibility makes it easy to create your own techniques.
Earhoof is a powerful instrument creation tool. Not only does it allow you to layer multiple audio files, it allows you to continuously alter the sonic properties of these layers along the length of the instrument. By drawing curves for the effect parameters (Gain, Pitch, Pain, Filter Frequency and Q, Delay Send, and Sample Offset), it is very easy to create expressive instruments which sound different at each point along the playing surface. Importing your own WAV or AIFF files is as simple as dragging and dropping into the app via iTunes File Sharing.
Lots more info here http://www.psicada.com/index.html
Absolutely no idea what it sounds like