the one that I’ve been using heaps is Blackhole.
I’m not sure exactly what your use case is, but below are some steps to record either the screen and audio (while being able to hear the audio from your speakers as usual) or just recording internal audio. After installing blackhole:
- find an app called «Audio MIDI Setup»
- at the bottom of the left pane, click the + icon and «Create Multi-Output Device». If you click the text on that new device «Multi-Output Device» (still in the left pane) you can rename it.
- in the «Use» column of the main pane, tick Blackhole and MacBook Pro speakers. (tip: you can also add your bluetooth speakers, like AirPods, make sure they’re on and you’re wearing them though before you tick them)
- click the sound icon in the menu bar and select your Multi-Output Device (not Blackhole 2ch).
- To begin a movie/screen recording: hit «command» + «shift» + «5». A tile with four columns will appear, typically toward the bottom of the screen, with icons. the first column is for screenshots, the 2nd column is for screen recording, the 3rd column is for Options, and the last column is to either Capture of Record.
- Select an option in the 2nd column and resize the capture window if necessary.
- Click on Options in the 3rd column and change your Microphone to «Blackhole 2ch» or whatever yours might be called.
- Record
- Select an option in the 2nd column and resize the capture window if necessary.
- To begin an audio recording, open QuickTime, a window will appear for you to select a file to open. ignore it.
- right/secondary click the Quicktime app icon in the dock, or click File in the menu bar.
- Select «New Audio Recording»
- a small window titled «Audio Recording» appears. click the downward arrow icon to the right of the record button and change your microphone to «Blackhole 2ch» (or equivalent).
- Click record.
- right/secondary click the Quicktime app icon in the dock, or click File in the menu bar.
- voila have fun!