Why has Audacity suddenly stopped recognizing my home studio configuration which is based upon a Newmark M6USBDJ mixer, I to which I have two Technics Quartz turntables, a CD player, a Pyle dual cassette deck and a Behringer interface for my two microphones? I am a voiceover and commercial DJ spokesman.
I assume all of that equipment has one USB connection to the computer?
Check your Windows Permissions/Privacy Settings.
And/or try Listen To This Device to make sure Windows is getting a signal.
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Yes. The M6 mixer is “the brain”
Also, how do I pr where do I find “windows permissions/privacy settings”? I looked to only find major frustrations! OMG! How do I find “Listen To This Device to make sure Windows is getting signal”? I tried. Is this on Audacity tool bar or in my Windows Control panel. I am at a loss, people. 
All right thank you for the reply so far but they have not worked and I think I have figured out what I need to do I just need to revert to audacity version 3.2.1 because that’s the last time it worked with my USB numark mixer in my home studio for voiceover and DJ music. I tried to find the link that’s these site or hit a dead end very confusing. Can anybody give me a direct link please to download Audacity version 3.2.1? Many thanks.
Older versions of Audacity are here.
(You might have to right-click.)
Well, I went back to and downloaded/installed Audacity 3.2.1 since 2023 was the last version that recognized my set-up and worked for both music recording and my voice-overs, but I STILL cannot get a signal. I tried “WindowsDirectSound, MME and Windows WASAPI” all to no avail. Is there anything else I can try, please. This is very frustrating now.