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.
Assign knobs to individual note volumes/velocities?
I'm wondering if this idea is possible. I'd like to have a setup where I can choose several (maybe 4-8) notes that would be held in a chord and sent to a synth. And then I'd like to be able to assign knobs on an external controller to individually change the volumes or velocities of each note while the notes are being held together. The objective is to be able to bring individual voices of a chord in and out gradually (or at any given rate).
To be more specific, I'd like to send the chord voicings to AudioKit Synth One (IAA) because it can take Scala files through its Tuneup feature, and I'll be using non-12TET.
I suppose I still have a lot to learn about iOS music and synthesis in general, so is this even possible with a polysynth? I.e. can a synth handle velocities that change differently between different incoming notes? If so, can I execute this in iOS?
Any advice is greatly appreciated.