Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.
Download on the App StoreAudiobus is the app that makes the rest of your setup better.
MIDI Track From Electric Guitar?
Yes, the app is called "MIDI Guitar 2.5" and it's available for desktop and iOS. By far the best pitch to MIDI system I've used, even over hardware solutions.
Comments
There are a number of apps that can try to convert audio to MIDI with various levels of accuracy and latency. An extend discussion of these issues could be very informative.