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.
Using "MIDI Wrench" for "Gozinta" problems?
My understanding of USB connectivity is still poor. I was hoping a powered USB hub would let my controller connect to several iphones and activate apps on each using MIDI Channels.
I tried it and nothing came out. So, I launched MIDI Wrench on each IOS device and realized none of them recognized the HUB. If I connect the controller to each device MIDI Wrench showed the connection.
So, I went back to the YouTube video that planted the idea that a HUB would allow a more complex set up and realized he was demo'ing 1 IOS device that connected to multiple controllers to simulate a 2 tiered organ setup.
Insight #2: I own a USB-powered audio/midi Prosonus AudioBox. It NEVER occured to me that it might work with IOS but just with my MacBook. Then in a thread here someone mentioned a USB approach should work with any USB-Powered interface. What? I tried it and it didn't light up. Then I added power to the Apple Camera Adapter's Lightning Port power input and the Prosonus AudioBox power light came on...
It only goes to show that "you learn something new everyday" but at my age I also forget 2 things so... what was I talking about?