SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
Splice - Music creation, collaboration, and sharing made simple.
GSnap - With GSnap you can get an auto-tune effect.
n-Track Studio - Audio recording and music creation app for iOS.
keezy - A colorful soundboard. Play with music.