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Bed tracks and object tracks in Logic Pro for Mac

A Spatial Audio with Dolby Atmos mix has two types of tracks: object tracks and bed tracks. They are fundamentally different in terms of how they handle audio signal routing and panning.

Figure. Bed tracks and object tracks routing.

Bed tracks

A bed track in a Spatial Audio with Dolby Atmos mix behaves like a conventional channel-based surround track. This is the exception to the object-based concept of the Dolby Atmos format. The audio signal on a bed track is routed to a multichannel bus, and the Surround Panner control on each bed track pans the signal across each channel of that multichannel bus. Each channel corresponds to a dedicated speaker for that surround setup (L, R, C, Ls, Rs, LFE, and so on).

The implementation of bed tracks in Logic Pro for Mac is as follows:

  • Any newly created track in your project will be a bed track.

  • The channel mode of a bed track can be mono, stereo, or surround.

  • All bed tracks are routed to the same surround output, referred to as the surround bed.

  • A Spatial Audio with Dolby Atmos project in Logic Pro has only a single bed, which means all bed tracks in your project are routed to the same surround bed.

  • The Surround Format pop-up menu in the Logic Pro Audio project settings lets you set the channel mode of the surround bus to 7.1.2 (default), 7.1, or 5.1.

  • The signals of all bed tracks, which are routed to the surround bus, will be sent to the surround master channel strip and processed by any plug-in placed before the Dolby Atmos plug-in.

  • The maximum channel width of a surround bed is 7.1.2, a format that has only one pair of overhead speakers above the listener position (Ltm and Rtm). This means you can’t position a signal at the front or back of the ceiling.

Object tracks

Object tracks are different from bed tracks in several ways:

  • The audio signal of an object track is routed as a mono or stereo signal directly to the Dolby Atmos plug-in without going through any pan control.

  • The Dolby Atmos plug-in can have up to 118 objects. Think of it as a multitrack tape machine that has 118 tracks to record on.

  • Any track that is routed to an object becomes an object track. A stereo track uses two objects.

  • Mono tracks and stereo tracks can be routed to an object, but surround tracks cannot.

  • In Logic Pro, the pan control of an object track is always the 3D Object Panner.

  • The 3D Object Panner lets you position the audio signal in the three-dimensional space without the restriction of speaker positions. See Overview of the 3D Object Panner.

  • The audio signal of an object track is routed directly to the corresponding object input on the Dolby Atmos plug-in. The pan settings (static or automated) generated on its 3D Object Panner are sent as separate metadata to the same object input.

  • An object track can’t be routed directly to the LFE channel of a Spatial Audio with Dolby Atmos mix.

  • The audio signals of all the individual objects and their corresponding pan information are kept separate when exporting the Spatial Audio with Dolby Atmos mix to a Dolby Atmos ADM BWF master file (used for delivering a Spatial Audio with Dolby Atmos mix to Apple Music or other streaming or optical media mastering and encoding services).

Change a bed track to an object track

In Logic Pro, any newly created track in a Spatial Audio with Dolby Atmos project is a bed track. To change it to an object track, do one of the following:

  • Click the Output slot on the channel strip and choose 3D Object Panner from the pop-up menu.

  • Control-click the Surround Panner control on the channel strip, then choose 3D Object Panner from the pop-up menu.

  • Select multiple channel strips, then click one of the Output slots and choose 3D Object Panner; all selected bed tracks will change to object tracks.

The label on the Output slot changes from Surround to Object.

Change an object track to a bed track

  • On the channel strip in Logic Pro, do one of the following:

    • Control-click the 3D Object Panner control and choose Pan.

    • Click the Output slot and choose Pan or Output > Surround.

The label on the Output slot changes from Object to Surround.

Download the guides:

Logic Pro User Guide: PDF

Logic Pro Instruments: PDF

Logic Pro Effects: PDF

Control Surfaces Support Guide: PDF

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