(No need to actually record anything.) This is useful for me because it means I can mix in Auria Pro and monitor on my iMac speakers. (Hardly professional engineering I know, but it's what I've got, and it's better than headphones-only.)

TIL that you can use an iOS device connected to an OS X device as an audio input, as described here:

makeuseof.com/tag/play-audio-i

What the article doesn't say is that you'll need to use some kind of app with an input monitor to actually listen to the audio coming from your iPhone/iPad. Open up Quicktime Player, choose 'New Audio Recording' and make sure your device is selected in the pulldown next to the red record button. If you play audio from your iOS device you should now hear it in QT.

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