Dell 780 Optiplex record input get muted.

I am running Windows 10 home. I have a Logitec 260 webcam, and I sometimes connect a record turntable to record albums. If I want to use the webcam I can show video but the audio is muted. If I go into audio settings recording ( in Windows) it shows my webcam as a microphone. If I then go to properties I can set the level, but while I am watching it will go to zero and mute the microphone. This is crazy.