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.
Volume control on individual notes
Volume automation is done on a track. If volume goes up and down on a single note during its duration (human voice can modulate flexibly), how do musicians control the volume/velocity of single/individual notes in their project? Using volume automation on single/individual notes may be an overkill. Using multiple adjacent notes with varying velocity may still produce breaks in the note and not continuous.
I wish there were multiple velocity points on each note (or ability to add velocity points) and set velocities during the note duration at granular level to make it sound as natural as possible.