TouchOSC allows to remote control and receive feedback from software and hardware that implement the OSC or MIDI protocols such as Apple Logic Pro/Express, Ableton Live, Renoise, Pure Data, Max/MSP/Jitter, Max for Live, OSCulator, VDMX, Resolume Avenue/Arena, Modul8, Plogue Bidule, NI Traktor, NI Reaktor, Quartz Composer, Supercollider, vvvv, Derivative TouchDesigner, Isadora and many others.
KORG Module is a high-quality sound module app for iOS that contains a professional sound library. With just your iPad/iPhone and a MIDI keyboard such as the new microKEY, you can play studio-quality keyboard and grand piano sounds anywhere.
You can also use the sounds of KORG Module for the KORG Gadget music production app.
Lemur allows you to turn your device into a fully customizable MIDI control surface. Lemur has more features which makes it a lot more powerful than TouchOSC.
However, this functionality comes at the cost of complexity and makes Lemur harder to get started with. But if you want to make sure you have every single control option available, it is the most powerful control software you can have.

While retaining the intuitive beat-making features of the iELECTRIBE, the special Gorillaz Edition is a new machine customized to generate Gorillaz samples from their fourth album “The Fall” which allow the user to create music in a wide variety of musical styles.
The iELECTRIBE Gorillaz Edition features: a unique design and synthesizer engine including 128 new sounds created by Gorillaz; and 64 ready-to-use pre-programmed patterns by the sound team Gorillaz, Stephen Sedgwick, and Korg.