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.
OT: Roland Go:mixer... PRO!
That’s where the Go:Mixer Pro comes in. It’s a stereo in/stereo out interface to phones and smartphones and computers, but it’s also a mixer. (It’s a standalone mixer, too, and you might even wind up using it just as much as that.)
You can connect and mix multiple inputs (9 channels in, 2 channels out):
Two 1/8″ stereo line inputs (for other mobile gadgets, a drum machine, a synth, whatever)
Two 1/4″ instrument inputs (two mono or one stereo pair)
Guitar/bass instrument 1/4″ jack input
Minijack plug-in mic (for a lapel mic, etc.)
One XLR/jack combo mic connection with phantom power