ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
Music Studio Lite - Music Studio Lite is an audio management application that provides easy-to-use commands for creating sounds clips with frequency, pitch, loops, rhythms, or others as an entertainment source.
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
Medly - Tap & draw to create your song. No musical skills needed.
cassini - Polyphonic Synthesizer for iPhone/iPod touch
AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹