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 Store
Audiobus is the app that makes the rest of your setup better.
Erol Singer's Studio - Voice Lessons by Erol Studios
Ran across this app on my phone for the first time today and am interested but wondering if anyone here has experience with it, other recommendations, or thoughts on the topic? I've considered getting some voice lesson to improve my vocals and this is cheap compared to those...but still pricey at $45.