Audulus - A universe of sound at your fingertips - Audulus is a modular music processing app
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
Blocs Wave - A free audio app for creating music loops.
ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
FL Studio Mobile - Create & save multi-track music projects on a smartphone
zMors Modular - Full featured modular synthesizer for iOS