Using the Doing Atmos Renderer Send and Return plugins in Pro Tools can produce audio alignment and latency issues. The following steps should be taken to avoid alignment issues between audio input to the renderer and/or outputs from the renderer (speaker or re-render outputs).
- All renderer inputs (that is, any audio path prior to a Send plugin) should have the same latency: either with zero-latency plugins or with the same plug-ins inserted on all tracks.
- the Send plugins routes audio to the Atmos Renderer ahead of automatic delay compensation in Pro Tools. If different inputs have different latencies they will be mixed together in the renderer without any type of compensation. Note that this is regardless of inserting the Send plugin directly in a track or indirectly in an Aux bus.
- All renderer outputs (that is, any audio path containing a Return plugin) should be use a dummy bus as the aux track input and no plugins should be used/inserted on the track.
- If an output has plugins with reported latency upstream of the output, Pro Tools will apply latency compensation which will result in latency vis a vis other outputs.
- Dynamic processing should be disabled in the Playback Engine settings.
- When dynamic processing is enabled, Pro Tools may not activate Send or Return plugins that sit in "dead paths" in terms of Pro Tools. Not executing Send or Return plugins can cause problems such as muted signals and misalignments.
- When using HDX hardware, all Send and Return plugins should be DSP. If Native versions are used, Native and DSP cannot be mixed as they have different latencies.
- Send/Return plugins have different inherent latencies in Native and in DSP implementations. Mixing them will result in alignment issues.