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My first thought is: through the micro USB port, exploiting the OTG feature. A few variations on googling 'android external microphone' lead to http://www.androidaudiorecording.com/record-from-a-usb-micro....

Sorry if you've been down this road already.

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Yeah, I've seen that one, and it's a clumsy solution, at best; it has a custom USB driver and only works with that one piece of software (or did, last time I looked at it). It's certainly better than nothing, and it's cool that something exists, but the lack of general purpose USB audio interface support in Android is frustrating as hell, especially since iOS has had it for so long.

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