Will my audio interface work with Linux/JACK?

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Any interface supported by ALSA or FFADO will work with JACK.

List of known ALSA supported devices

List of known FFADO supported devices

In general, it is good practice to ask questions before commiting to making a purchase, to make sure that a device is supported. The Linuxmusicians forum is a good place for this, as is the Linux Audio Users mailing list.

Also check out - Understanding recording hardware

For a comprehensive list of known supported hardware, check out this AV Linux forums thread