BlackHole is a modern MacOS virtual audio driver that allows applications to pass audio to other applications with zero additional latency.

• Features
• Easy Installation Instructions
• Usage Examples
• Advanced Installation Instructions
• Feature Requests
• FAQ
• Wiki

• Supports 16 audio channels.
• Customizable to 256+ channels if you think your computer can handle it.
• Supports 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz sample rates.
• No additional driver latency.
• Works on macOS 10.10+ including macOS 10.15 Catalina

1. Download BlackHole.vx.x.x.pkg
2. Close all running audio applications
3. Open and install package

BlackHole is also available using brew cask install blackhole

Visit the Wiki for application specific setup.

1. Setup Multi-output Device
2. In Audio Midi Setup->Audio Devices Right-click on the newly created Multi-output and select "Use This Device For Sound Output"
3. Open DAW and set input device to "BlackHole"
4. Set track to input from channel 1-2
5. Play audio from another application and monitor or record in your DAW.

1. Set output driver to "BlackHole" in sending application
2. Output audio to any channel
3. Open receiving application and set input device to "BlackHole"
4. Input audio from the corresponding output channels

1. Build driver in Xcode
2. Copy BlackHole.driver to /Library⁩/Audio⁩/Plug-Ins⁩/HAL
3. Restart CoreAudio with terminal command sudo launchctl kickstart -kp system/com.apple.audio.coreaudiod

1. Delete BlackHole.driver from /Library⁩/Audio⁩/Plug-Ins⁩/HAL
2. Restart CoreAudio with terminal command sudo launchctl kickstart -kp system/com.apple.audio.coreaudiod

If you are interested in any of the following features please leave a comment in the linked issue. To request a features not listed please create a new issue.

• Sync Clock with other Audio Devices
• Output Blackhole to other Audio Device
• Add Support for AU Plug-ins
• Inter-channel routing
• Record Directly to File
• Configuration Options Menu
• Support for Additional Bit Depths

BlackHole is an audio interface driver. It only shows up in Audio MIDI Setup, Sound Preferences, or other audio applications.

Setup a Multi-Output Device

Unfortunately macOS does not support changing the volume of a Multi-Output device but you can set the volume of individual devices in Audio MIDI Setup.

Audacity is not compatible with Catalina. But there might be a work around.

• Check System Preferences -> Security & Privacy -> Privacy -> Microphone to make sure your DAW has microphone access.

• Check that the volume is all the way up on BlackHole input and output in Audio Midi Setup.

• If you are using a multi-output device, due to issues with macOS the Build-in Output must be enabled and listed as the top device in the Multi-Output. https://github.com/ExistentialAudio/BlackHole/wiki/Multi-Output-Device#4-select-output-devices

BlackHole is licensed under GPL-3.0. You can use BlackHole as long as your app is also licensed as GPL-3.0. For all other applications contact me directly at [email protected].