Rob Fielding, the long time iOS developer who's helped bring us Geo Synthesizer and Mugician, has released his latest invention! The Universal app Cantor is both simple and vastly complicated, offering a minimal interface with basic wavetable synthesis, but elaborate MIDI hackery for those that want to explore that.
I hate to copy-paste iTunes descriptions, but Rob describes Cantor best as:
A Microtonal Guitarist's synth, designed for extreme playability on the iPhone and iPad. It is the successor to Geo Synthesizer and Mugician. It does send a specialized MIDI output (requires a multi-timbral synth that can handle independent channels is all but necessary, such as SampleWiz or ThumbJam in OMNI mode, or Arctic Synth). The internal synth is driven by the actual MIDI output, because external MIDI synths are the main point of this project rather than the internal audio engine. It has a basic looper/delay combination, and the loop can be copied out as a sample to the general pasteboard for apps such as GarageBand.
He's got a long tutorial for it in a video available here, but the audio levels are all fucked up. Instead of I'm embedding a jam he's done while experimenting with the looper functionality, so you can see how it is played on the screen.
Sounds like a Guitarist picking a fight with the whole String Section... and winning!