Zoom L-20 LiveTrak
That's a class-compliant USB audio interface, a 20-track mixer and it sounds excellently and even allows for the recording of each individual track and the stereo output to an SD card (mine has a 256GB capacity). Total compatibility with Loopy Pro.
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Community reviews
IMHO, that's the ultimate Loopy Pro USB audio interface: You have two stereo busses, one of which I use for Loopy Pro's master output, the other for an external MPC which I sync alongside plenty of other instruments to Loopy Pro. In my weekend studio, I also own an L-12 which is a smaller but still capable version of this amazing device.