As previously explained, you need to select the correct recording device in Audacity’s Device Toolbar.
- Host: MME is usually best to start out with.
- Recording Device: - Choose the turntable’s USB Audio CODEC. It may be called “Prolix USB Audio CODEC” or similar. We cannot tell you what it will be called exactly. If you do not see any such device in Audacity, use Transport > Rescan Audio Devices at the top of Audacity.
- Recording Channels: Choose mono or stereo as you wish. If you choose stereo, see the green box here Audacity Manual for how to make sure Windows has the turntable set to stereo recording.
- Playback Device: Choose your computer speakers. Do not choose the turntable USB Audio CODEC.
You should have a good read of this: Recording with USB turntables or USB cassette decks - Audacity Manual.
Gale