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.
Arpeggiators are stuck on 1 note ... for all my apps! [SOLVED]
In multiple apps (GarageBand, Rozeta, Groovebox at a minimum), when I enable an arpeggiator, it will play however many notes are selected ... but as the tonic only! It will just repeat the first note of the chord multiple times. If I enable multiple octaves, then it bounces between the octaves, but it never plays any other note of a chord! It's the weirdest thing to me that I get the same result in multiple apps.
It suggests to me that maybe there's some shared OS arpeggiator component that got wonky somehow. Can anybody give me any idea how to fix this? I've tried rebooting my phone ... I've tried googling various things but can't find anyone with a similar problem ... should I start with Apple support and try to get them to fix my GarageBand and assume that will fix everything? Any better ideas? Can you think of something stupid I might be doing?