TC-11 is by far my favorite synth app on iOS, and I have a lot of em.
Nothing comes close, and in fact it is in a class by itself.
I have had it for a few months, and the more I play with it the better I like it.
Here is a link to the developers web site.
http://www.bitshapesoftware.com/instruments/
The presets cover a very wide range of sound types, from Buchla, and Serge type sounds, to lush pads, percussive sounds, evolving sounds, sequences, arpeggiations, traditional VA synth sounds, west coast to east coast, and everything in between.
Also great movement in the stereo field.
The important thing to know, is how you can change (modulate) those sounds while you are playing them, and how the patches take great advantage of the many ways to do that, using all the potential of the iPad/iPod/iPhone.
Multitouch, one or more fingers on the iPad, how fast you move your finger(s) across the surface, the distance from the previous touch, where you touch, which direction you slide your finger(s), how much area of finger you put down, motion of the iPad, and so much more, is used to modulate different aspects of the sound.
It is literally in a class by itself.
I like the large number of well made presets so much, it took me a while before I read the owners manual, to see how it works, and learn more about the interface., and the synth engine behind it.
Once again, my mind was blown by how it works, and what is possible with it.
The synth engine is designed from the ground up, to take full advantage of the iPad's Multitouch and motion sensing.
The best I have seen on iOS devices, and nothing like synths that try to imitate traditional hardware synths.
Click on the link to download the owners manual.
http://www.bitshapesoftware.com/inst...-guide-2.0.pdf
Because you don't have to look at it, to play it, I found myself walking through the woods with my iPod touch and headphones, creating lush soundscapes, with one or two hands.
Like no synth experience I've ever had before.
Playing it on my iPad Pro 12.9" is crazy cool too.
Best of all is having it loaded on all three of my i devices, iPad Air 1st gen, iPad Pro 2nd gen, and iPod Touch 5th gen, and having a jam session.
Because it's so portable, I can play at home through my PA speakers, walking around, or on a park bench with the built in speakers, Bluetooth speakers, or headphones.
If you want to try a free version, before buying the full version, check out TC-Performer.
http://www.bitshapesoftware.com/inst.../tc-performer/