Bob,
Some of the Line 6 POD's may have USB audio out (HD500X for example); probably not an ideal choice for a way to get the keyboard audio to the computer .. but may actually work.
I assume he got one that does what he needs. If he bought a lesser model I agree, he won't find joy.

From https://www.guitarcenter.com/Line-6/POD-HD500X-Guitar-Multi-Effects-Processor-1370873715031.gc?pfm=item_page.rrt1|ClickCP#productDetail
"Connect to your computer via USB for multi-channel, studio-quality recording with your favorite DAW software-or tap into POD HD Edit, the free editor/librarian software that makes it easy to tweak and organize all your tones"

Or so it seems.
Haven't tried one with PGProducts though.
I suppose if you disabled all effects you could use it as an interface .. then again with PGProducts you may need to make sure it can adjust to 16/44. I'd guess it defaults to 24/48.
Again, not an ideal choice but maybe doable.
(image from Line6 POD HD500X manual)

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Last edited by rharv; 01/13/19 09:04 AM.
Make your sound your own!
.. I do not work here, but the benefits are still awesome