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.
iPad 2 almost unusable after updating iOS
Just thought I'd share my experience, just in case any others are considering doing this.
Monzo Jnr is attending a 'coding club', and they require an app on his iPad that only runs on iOS 8+. I've kept this on 7x for years due to warnings about bad performance for newer versions, but finally relented and updated it to the latest compatible version (9x) so he can use it for this app.
The device is now pretty much unusable - typing anything on the keyboard has such a lag as to be impossible, and apps load and run so slowly it's pretty pointless using them. Switching apps, doing anything at all is grindingly slow.
If you're thinking of doing this my advice: don't. You might be able to install newer apps, but running them will have you tearing your hair out.