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Audio MIDI Setup User Guide
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macOS Catalina 10.15
macOS Mojave 10.14
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Table of Contents

Set aggregate device settings in Audio MIDI Setup on Mac

For your aggregate device to work correctly, you may need to set the sample rate and drift correction for one or more of its devices.

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Set the sample rate

All devices in the aggregate device need to have the same sample rate. The sample rate of each device should match the sample rate of the device chosen from the Clock Source pop-up menu.

  1. In the Audio MIDI Setup app on your Mac, click the disclosure triangle next to the name of your aggregate device in the sidebar.

  2. Above your aggregate device, select one of the devices that’s used in your aggregate device.

  3. In the right side of the window, click the Format pop-up menu, then choose the sample rate and bit depth for the device you selected.

  4. Repeat steps 2 and 3 for each device used in the aggregate device, choosing the same sample rate and bit depth for each device.

Enable drift correction

If the devices in your aggregate device aren’t synchronized using hardware, you need to enable drift correction, also known as resampling, to compensate for drift in the data between devices.

  1. In the Audio MIDI Setup app on your Mac, select the aggregate device in the list.

  2. Choose your aggregate device settings.

    • If all of the devices in the aggregate device aren’t synchronized through hardware, click Clock Source, then choose the device with the most reliable clock. Then select the Drift Correction checkbox for each device.

    • If some of the devices in the aggregate device are synchronized through hardware, click Clock Source, then choose the hardware synchronization’s clock master. Then select the Drift Correction checkbox for each device that isn’t synchronized through hardware.

    • If all of the devices in the aggregate device are synchronized through hardware, click Clock Source, then choose the hardware synchronization’s clock master. Make sure none of the Drift Correction checkboxes are selected.

See alsoCombine audio devices into a single aggregate device in Audio MIDI Setup on MacIf an audio device isn’t working in Audio MIDI Setup on MacIf your audio apps stop working while using Audio MIDI Setup on MacIf audio switches to a different device in Audio MIDI Setup on Mac
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