I think this answers my question:
https://askubuntu.com/questions/425333/how-to-make-aptx-capable-bluetooth-equipment-work-with-ubuntu

It looks like you do need AptX support in the dongle.  Also, something I hadn't considered is that AptX is proprietary, not FOSS.

On Sun, Dec 30, 2018 at 10:06 AM joseph.leblanc via WLUG <wlug@lists.wlug.org> wrote:

The one that I didn't have any trouble with was Panda 4.0

On 12/28/18 10:24 PM, Richard Klein via WLUG wrote:
I'm looking at bluetooth dongles for my desktop. Is Apt-X support provided by the hardware or the OS?

--
Rich

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