How to send VoiceOver audio to a voice call

How to send the audio from VoiceOver to a voice call like Google Meet, Zoom or Microsoft Teams.

Before you start, you'll need:

• Headphones — to stop speaker audio coming through your microphone.
• macOS

Overview

Steps

1. Install Blackhole
2. Create a Multi-Output Device for your Headphones and Blackhole to receive audio
3. Create an Aggregate Device to mix together your Microphone and Blackhole
4. Configure VoiceOver to use Multi-Output Device
5. Configure Voice Call to use Aggregate Device

1. Install Blackhole

Blackhole is a virtual audio device.
Audio sent to Blackhole can then be used as an input in other applications.
It is similar to LoopBack but is free and open-source.

If you have brew installed:

brew install blackhole-2ch

or follow the Blackhole installation guide.

2. Create a Multi-Output Device for your Headphones and Blackhole to receive audio

Send audio from VoiceOver to both Blackhole and your Headphones — so we can hear it ourselves.

Make sure your headphones are plugged in.

1. Open the Midi Audio Device window by opening Spotlight with command ⌘ + space and typing Midi Audio Device.
2. Create a new Multi-Output Device device by pressing the plus (+) icon.
3. Select Blackhole and Headphones, making sure Blackhole is first.

Do not set 'Use This Device For Sound Output', we will setup VoiceOver to use this device.

Find a full walkthrough of creating a Multi-Output Device on the Blackhole wiki.

3. Create an Aggregate Device to mix together your Microphone and Blackhole

1. Create a new Aggregate Device device.
2. Select Blackhole and Microphone, make sure Microphone is first.
3. Right-click and set the Aggregate Device as your default input.

Find a full walkthrough of creating a Aggregate Device on the Blackhole wiki.

4. Configure VoiceOver to use Multi-Output Device

1. Open the VoiceOver Utility window by opening Spotlight with command ⌘ + space and typing VoiceOver Utility.
2. Go to the Sound tab and set the Output Device option to Multi-Output Device.

5. Configure Voice Call to use Aggregate Device

1. Open your Voice Call settings and set your input to Aggregate Device.
2. Ensure any Noise Cancellation is turned off.