Syntronik by IK Multimedia is "a cutting-edge virtual synthesizer that raises the bar in sound quality and flexibility thanks to the most advanced sampling techniques combined with a new hybrid sample and modeling synthesis engine." With this layout you can mix the 4-part layers, control its four arpeggiators and load instruments. You can also modify all parameters of Part A and B. Unfortunately Syntronik can receive on only one MIDI channel; as a result, I didn't have enough Midi Control Change messages to program Part C and Part D.
Warning: If you move the Tune knob you can only reset it to zero only with your mouse! The best you can do with a midi CC is +0.28.