Hello Scott,

> Henri Derksen  wrote:
>> I understand, and I did know that kind of wrong input selections.
>> But the Pi 4B has no audio input on the MoBo,
>> only a socket for an extra camera on a flatcable, which I do not have.
>> The most logical idea could be that Raspbian Buster Linux does not have a
>> USB2A mic audio in software module, and can only work with the camera on
>> the motherboard socket if connected?

> The Raspberry Pi cameras don't have microphones.

OK, I did not know that, thanks.

> On a Raspberry Pi 3 connected to one of my 3D printers, I set up a
> Microsoft LifeCam HD-6000 for monitoring the printer.
> It has a microphone, and poking around in alsamixer reveals that
> it's showing up as an input device.

Ah, can you hear remotely via that mic that it is printing?

> lsusb
> shows snd_usb_audio in use.

Mine shows only its vendor and product ID  6366:3370

> It works pretty well at streaming 720p video from my printer, though I
> should probably look into switching it from autofocus to manual focus as
> it sometimes gets confused.

My new camera works ok, but at the Pi no sound from the mic.
To day I tried my cam and mic on the Win10 machine of a friend,
and both worked ok there.
So the error must be in Raspbian Buster Linux, or in the Chrome webbrowser.
A friend of my told me the mike of his webcam did not work either in Rasbian
Buster Linux, but in Ubuntu Linux it worked ok. I donot know which Pi he used.
I tried that to, but got other errors first, as Ubuntu comes with FireFox and
not with Chromium. In FF I got many ads, mostly from Google, unworkable.
Second I had no incoming sound with Ubuntu.
In the worst case scenario I have to use one Pi with Raspbian Buster Linux for
outgoing picture and incoming soud, and use the other Pi with Ubuntu and the
second identical camera for the outgoing sound.
Strange way of communicating, don't you think?
So there must be a way of using only one Pi and one camera to both send and
receive pictures and sound, with a browser for Zoom, Jitsi and Skype.
Any ideas?

Henri.

---