QuickTime Player for easy iOS Audio Input
If you've got your device plugged into your Mac - just fire up QuickTime Player - Select a new Audio Recording - and you should see your iOS device as an input source in the drop down. No IDAM or other special sauce required. No need to record either - can just use for playing through whatever outputs you've got set up on the Mac. In AudioBus you'll see in the Output the "System Capture" device.