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Set up for mixing in Dolby Atmos in Logic Pro

Mixing in Dolby Atmos is processor intensive and requires a higher sample rate and large I/O buffer size. As such, recording audio or performing live with software instruments while mixing in Dolby Atmos is not recommended. To save processing power, you can use the Freeze or Bounce in Place functions for software instrument tracks.

Sample rate

Dolby Atmos projects support native sample rates of 48 kHz and 96 kHz. In projects with sample rates of 44.1 kHz or 88.2 kHz, Logic Pro converts bed and object tracks in real time to 48 kHz or 96 kHz, respectively, before they are rendered by the Dolby Atmos plug-in. This conversion may affect performance depending on the nature of your project and available computing power. Therefore, setting the sample rate of your project to 48 kHz or 96 kHz at the outset is recommended if you plan to mix in spatial audio.

I/O buffer size

If your project has a sample rate of 44.1 kHz or 48 kHz, set the I/O buffer size to a minimum of 512 samples. If your project has a sample rate of 88.2 kHz or 96 kHz, set the I/O buffer size to 1024 samples.

Choose the option from the I/O Buffer Size pop-up menu in the Devices settings window. See Devices settings in Logic Pro.

Frame rate

The required frame rate for a Dolby Atmos music mix is 24 fps. Logic Pro automatically sets the frame rate to 24 fps when you create a new Dolby Atmos project or when you change the Spatial Audio parameter in the Audio project settings to Dolby Atmos.

To manually set the project to 24 fps, choose File > Project Settings > Synchronization, click General, then choose 24 fps from the Frame Rate pop-up menu.

Surround format

When you create a Dolby Atmos project, Logic Pro automatically sets the project surround format to 7.1.2. This setting determines the surround format of the project’s surround bed, and as such, the output channels available for the surround bed. If you want to use 5.1 or 7.1 as the surround format for your bed tracks, you can change the surround format in the project settings. Choose File > Project Settings > Audio, click General, then choose the desired setting from the Surround Format pop-up menu. See Set the surround format in Logic Pro.

Speaker configuration

When you mix in Dolby Atmos with a dedicated immersive speaker setup, you need to configure the Output settings in Logic Pro. To select which speakers are connected to the outputs of your audio interface, choose Logic Pro > Settings > Audio > I/O Assignments > Output. See Set I/O Assignments and bounce extensions for Logic Pro surround projects.

Download the guides:

Logic Pro User Guide: Apple Books | PDF

Logic Pro Instruments: Apple Books | PDF

Logic Pro Effects: Apple Books | PDF

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