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.
Petition for fm essentials to unlock features without hardware
Saw this on reddit and thought id share, because this would be really nice.
"Yamaha's FM Essential App is one of the highest quality FM synth apps on iTunes. Unfortunately, a Yamaha MX Keyboard must be used to unlock the features of this app. There needs to be an in app purchase or an alternate version of the app that allows iOS users to use the full version without having to buy an MX Keyboard. Yamaha, please make this happen!"