I'm looking into getting a Line 6 M9 Stompbox Modeler. Do I need a separate audio interface to direct record into garageband?
For best results yes
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You can go directly into the mic input, but it sounds like butt plug.

You can get USB interfaces for cheap and it'll improve your sound by miles.
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You can but it will sound like shit because the M9 lacks the ability to directly record things, unlike a BOSS GT10 or a PODHD.

Line 6 sells direct recording interfaces, just get one of those.
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