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The US-224 is a USB1.1 audio/MIDI interface with a control surface. Linux support is provided through the ALSA snd-usb-usx2y module which applies as well to smaller US-122 and bigger sister US-428.

AFAICT these are pretty good hardware but I'm afraid already phased-out by Tascam, so most probably you may only find those second-hand. Avoid the newer US-122L and US-144 if you have Linux in mind. Those are not supported in ALSA.

The current state of the US-x2y line of devices in Linux is mostly due to Karsten Wiese stoicism. Major kudos must go to him, as he is the man that made it all work on Linux and specially on JACK, where a special dedicated back-end is included as to make use of the so-called raw usb mode achieving near-limit low latency which other USB devices only dream of :)

Cheers.