Windows 10 not picking up signal from USB audio device

[Microsoft Windows]

I'm obviously missing something simple - any advice or tips would be much appreciated.Here's the story: I am a hobby DJ, using turntables to mix vinyl. The mixer has a USB port, and I have connected it to my PC. I'm using software called Audacity to record audio from the mixer. This setup has worked perfectly for some years. Yesterday, when I fired it up to record a set, it wasn't playing ball. The software recognises the mixer as the default recording and playback device. The PC also shows it as the default device. I can hear what I'm playing - the levels are fine I'm on the mixer and speaker

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