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Sound cards will improve the sound quality of your system but if you don't have the appropriate speakers or headset, you will never notice the difference. The sound card offloads work from your CPU or GPU, which in return gives you better overall frame-rates while gaming.
I did actually speak too soon. Went back to the Pixelbook and the external card works no more. Spent over two hours on a Google chat last evening and they are, I believe, mystified and are continuing to help.