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.
The forthcoming iConnectMidi 4 looks a serious bit of kit for those with multiple IOS devices
I've long been a fan of the original iConnectMidi but this looks a serious bit of kit for the money for those looking to integrate multiple IOS devices into their set up (and most of here have at least two IOS devices). It even has an inter-device audio streaming trick up its sleeve - a kind of hardware based Audiobus! Headline specs as follows:
4 In & 4 Out pairs of MIDI DIN Connectivity
Connect 8 additional MIDI devices via USB Host Port + Powered USB Hub
Over 64 user configurable ports of 16 Channels of MIDI per port
Audio Pass-Through Between Up to 3 Computing Devices
Multi-Host Capability - Connect 3 Computing Devices Directly & More via Network
Integrated MIDI Manager With Snapshot Preset Storage - For MIDI Thru, MIDI Merge, Filtering, and Advanced Routing Control
Supports MAC, PC, and iOS Computing Devices
USB MIDI Class Compliant
Plug and Play - No Drivers Needed
Charge iOS Devices
Love the fact that it will charge your IOS devices at the same time as performing all those other wonderful tricks'
Every IOS device you own is now an easily integrated studio sound module and if you add a decent audio interface (such as the Focusrite Scarlett I've mentioned here before) to the more powerful IOS devices that you own you'll turn them into multi-timbral, multi-output devices too.
And all this for $199, really do reckon they've got a winner on their hands with this little box of wonders.