Hi all,

As I don't have a microphone to use with my azalia(4) sound card, and
my webcam only has audio input (no output), I can't use my current
hardware in firefox to do videoconferencing.  So I purchased (what I
thought was) a USB to audio adapter[1].  This one simply offers a
3.5mm jack connector that I would then plug my existing headphones
into for full duplex audio.

Unfortunately, it doesn't seem to be an actual uaudio(4) device:

uhidev0 at uhub0 port 1 configuration 1 interface 0 "Samsung Electronics 
Samsung Type-C to 3.5pi gender adapter" rev 2.01/1.33 addr 2
uhidev0: iclass 3/0, 2 report ids
uhid0 at uhidev0 reportid 1: input=0, output=63, feature=0
uhid1 at uhidev0 reportid 2: input=63, output=0, feature=0

Are there uaudio(4) devices that do provide full duplex (TRRS i.e. mic
plus speakers) behind a 3.5mm jack?  Anyone have experience with one
of these they can recommend?  I mean, I have a USB audio device that
has a 3.5mm jack, but that's output only (TRS, so no microphone).

Thanks,

Paul

[1]: 
https://www.samsung.com/us/mobile/mobile-accessories/phones/usb-c-headphone-jack-adapter-ee-uc10juwegus/

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