I want to do a screen recording but not hear the audio when doing the recording, but still capture it for the recording. So, I think I need another source. Also, doing a screen recording using the Mic, it picks up all the noise in the room.

I've been using Quick Time Player, and have selected several of the different audio sources.... none work.

I have the following options for video that don't work:
Build in Microphone/Internal Microphone
Mohave Sound Grabber (don't know what this is)
Sunflower (2 ch)
Sunflower (64 ch)
System Audio Recorder


Mac OS El Capitan
Quick Time 10.4
Mac Book Pro