How to record screen with the audio coming from your Mac?

I'm trying to record my screen and the audio **only** coming from my Mac. When I do a screen recording with quicktime, with audio settings: internal microphone, it records the video but with a lot of external noise (like cats). How do I make sure that the audio of what is being played on the screen (like music being played on my Mac) is recorded in the video file? I don't care if I'll have to record the screen and audio separately, or plug in earphones etc, I'd like to have a simple answer. I have already tried the suggestions in these other questions: - https://apple.stackexchange.com/questions/212829/how-to-record-both-screen-and-sound-with-quicktime-on-el-capitan - https://apple.stackexchange.com/questions/231427/how-to-record-the-sound-also-in-a-screen-recording-if-the-headphones-are-connect - https://apple.stackexchange.com/questions/60085/quicktime-screen-audio-capture Sadly their solutions don't work for me, as my recordings still capture external noises on macOS Catalina. What software or setup can do this?