record computer audio

to record the mac's internal sound with quicktime you need additional software. i use the free BlackHole Virtual Audio Driver. then you can choose "BlackHole 2ch" in the recording options instead of "Built-in Microphone."

you will also need to set up a multi-output device in your audio MIDI setup utility to be able to both hear and record the internal audio at the same time.

to set up a multi-output device:

Open Audio MIDI Setup: (found in /Applications/Utilities)

hit the '+' button in the bottom left corner and select "Create Multi Output Device"

then in the panel that appears on the right, in the Multi-Output Device tab, select "Built-in Output" AND "BlackHole 2ch". (and, if you want, any of your other connected devices.)

once you do that, (and BEFORE recording) you can choose "BlackHole 2ch" or "Multi-Output Device" in your menubar "sound options". 

to both hear the speakers and record the audio at the same time, choose "Multi-Output Device". before choosing multi-out, set the internal speakers' volume to a comfortable level first. you cannot control the volume once you are in multi-out mode.

I'm pretty sure that Audacity will let you do what you're after. It is a free open-source program.

https://www.audacityteam.org/

tomfromdorchester wrote:

How do you record computer audio?

I use Audio Hijack & their Fission for editing

https://rogueamoeba.com/audiohijack/

If you opt for the Blackhole solution, and change your mind, they have specific uninstallers you might want to have on hand as well.

https://existential.audio/blackhole/support/#system