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Make Dolby Atmos masters

Neutral Tracks makes Dolby Atmos masters with the standalone Dolby Atmos Renderer, with no special mode and no extra purchase from us. Your mix plays into the renderer over the Dolby Audio Bridge, Dolby’s own tools do the object panning, spatial rendering, and monitoring, and the renderer records the master file. Audio routed to the renderer bypasses your master bus, so nothing about this workflow can leak into normal exports.

How an Atmos mix is organized

An Atmos master has two kinds of content, and turning your project into one is mostly deciding which is which:

  • The bed is your mix, in surround. Set Main’s format to 7.1 (Output popover → Format) and mix as you always do. Every track still routes to Main, our surround pad places anything you want around the room, and your master chain still applies. The bed is the foundation; most of your mix stays in it.
  • Objects are the few elements you break out for free 3D placement and movement: a lead vocal, a hook, ear candy. Typically a handful, not dozens. An object track leaves your mix: it bypasses Main (and your master-bus processing) and feeds the renderer directly, panned by Dolby’s plugin instead of ours.

If you do nothing but set Main to 7.1 and follow the sync steps, you already get a valid Atmos master from the bed alone. Objects are the upgrade, not the entry fee.

What you need

  • The Dolby Atmos Renderer (its installer includes the Dolby Atmos Music Panner and Dolby LTC Generator plugins, and the Dolby Audio Bridge virtual device)
  • A project at 48 kHz, the Atmos ecosystem’s sample rate. An existing project can switch rate in place (Project settings); do it before mastering, not after
  • Headphones (binaural monitoring) or a speaker layout the renderer can address

Set up the renderer

  1. Create a master file (File → New Master File). This matters more than it looks: object inputs (11+) don’t exist until a master file is open. Without one, they meter but never render.
  2. Pick monitoring that matches your real outputs. Layouts declare the speakers you have; they never fold down. On a stereo interface choose 2.0. Choosing 5.1 or larger silently drops everything past your two outputs.
  3. For headphones, set Headphone Render mode to Binaural in the renderer’s preferences and enable Headphone Only mode. The speaker-layout list alone never binauralizes.

Route Neutral Tracks to the renderer

  1. Set Main’s format to 7.1 (Output popover → Format) if you haven’t. This is your bed. Your existing tracks, sends, and master chain are unchanged; use the surround pad to place anything in the room.
  2. Select “Dolby Audio Bridge” as your output device. It carries 128 audio channels plus two for timecode. Main lands on the bridge’s first inputs automatically: a 7.1 bed fills the renderer’s default bed on inputs 1–8.
  3. Break out your object tracks with direct outs. In each chosen track’s Output popover, pick a Hardware range on the object inputs: 11 and up, one input per object. This takes the track out of your mix: it now feeds the renderer alone, past your master bus.
  4. Pan each object with the Dolby Atmos Music Panner. Add it to the object track like any plugin and set its object number to the track’s input from step 6. Position and movement now come from this plugin. Our pan controls don’t apply to objects.

Sync and record

  1. Timecode: add the Dolby LTC Generator to a spare track, direct-out that track to channel 129, and set the renderer’s sync to LTC over audio on the same channel with matching frame rates. A sync error while your transport is stopped is normal, because no timecode is arriving yet.
  2. Record: arm recording in the renderer, press play in Neutral Tracks. The renderer rolls with your transport and records everything, including panner moves, captured as object automation. Stop when done. For streaming delivery, aim for −18 LKFS integrated and −1 dBTP true peak on the renderer’s loudness panel, the common spatial-audio target Apple Music validates against.
  3. Play the master back: switch the renderer’s Source to MASTER and turn its sync toggle off. While sync is on, the renderer’s own transport stays locked to your timecode. What you hear now is the finished master, playing from Dolby’s tool alone.

What you have now

The renderer wrote three files where you created the master: .atmos (the manifest), .atmos.audio (the multichannel audio), and .atmos.metadata (object positions and movement). Together they are the Dolby Atmos master: the format distributors and mastering engineers expect for Apple Music and other spatial platforms. The renderer can also export it as an ADM BWF file (File → Export Audio) where a single-file delivery is required.

Troubleshooting

  • Object inputs never light: no master file is open (step 1).
  • Surround content missing: the monitoring layout is wider than your physical outputs (step 2).
  • No binaural on headphones: enable Headphone Only mode; the render mode setting alone isn’t audible while the speaker path is active (step 3).
  • “External sync error”: normal while stopped; if it persists during playback, check the LTC channel number and frame rate on both sides (step 8).
  • The renderer’s play button does nothing: its sync toggle is still on (step 10).

Dolby, Dolby Atmos, and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. Neutral Tracks is not affiliated with or endorsed by Dolby Laboratories.