Just had a play with Caustic and all I can say it's Awesome!!
Went back and revisited this Universal app Caustic and was blown away with the sounds of the synths! FM Synth, Modular, Subsynth, Vocoder Synth and so much more!
Had six modules looping via Aleph Looper all on my iPhone 5s. Amazing!!!
Now that I understand IOS more it makes a whole lot more sense how it's all working. Caustic is awesome!!!