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 StoreAudiobus is the app that makes the rest of your setup better.
Stereo line-in portable recorder?
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I have the Zoom h4n Pro. It has the XY mic built in but it also has a stereo mic input that can also be used for line in. Also has 2 combo jacks. All the audio fir my YouTube channel is recorded with it. It’s fairly small, runs on batteries, and records to a SD card.
Zoom H1n might be the cheapest option with stereo line input.
Zoom H6 is the Swiss-Army Knife of mobile audio recording:
https://forum.audiob.us/discussion/comment/476301/#Comment_476301