SoundBetter - Marketplace for musicians and music production professionals
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
Melody ML - Easily separate audio tracks using machine learning
cassini - Polyphonic Synthesizer for iPhone/iPod touch
PrimoMusic - An iTunes alternative made to manage iPhone/iPod media files
zMors Modular - Full featured modular synthesizer for iOS