How to Share Audio (Not Just From a Chrome Tab) on a Mac

1. Point your browser to: http://existential.audio/blackhole/ to download the installer. The installer is sent via email after providing a name and email address.
2. To be safe, close all audio applications so you can ensure you have a clean install.
3. Open and install the BlackHole installer package.

Using BlackHole with Audio/Midi Setup and your Sound Preferences

• Open the Audio Midi Setup app (it's the app that looks like a piano keyboard and can be found in your "Utilities" folder with your Applications).
• Right-click on the BlackHole 16ch icon on the left side of the window.
• Select "Use This Device For Sound Output" and a little speaker will appear in the bottom right of the Blackhole device list (shown in the next two images).

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• Next, you need to create an Aggregate Device. This will allow you to select multiple outputs and have them all play out of one place. Click on the "+" at the bottom left corner of the screen and select "Create Aggregate Device".

• Select the devices that you want to be able to play at the same time by checking the boxes to the left of the device names you want to include. Don't forget to include your microphone! 

•  Now you need to move the BlackHole16CH output box. It's the yellow box located on the right side inside of the black window. Move this to the right in the chain by dragging and dropping. You will see a tiny yellow line that will let you know when you can drop it. 

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• Open System Preferences and select Sound.

• If it isn't already set, change this to BlackHole 16ch.