I screwed up Audacity with PulseAudio Volume Control

I’m a newbie to Linux, but an old user of Audacity. I’m using a computer with pre-installed Cinnamon.

I had been set up to record LPs with Audacity through a turntable with a preamp and line-out, and it was working. I had downloaded Audacity through the software manager. I’m using 2.4.1.

I was trying to follow this tutorial for capturing streaming: https://manual.audacityteam.org/man/tutorial_recording_computer_playback_on_linux.html

I downloaded PulseAudio Volume Control through my software manager and made the changes. It didn’t work and I decided to go back. But the PulseAudio Volume Control is not letting me undo the settings. It says “No application is currently recording audio.”

Can someone please help me get my turntable line-in working again?

Many thanks.