Mixing : Basic Mixing : Dither : Dither in Pro Tools

Dither in Pro Tools
There are several ways dither can be used in Pro Tools. Each has a specific application within the various operations that could benefit from using dither.
Dither Plug-Ins for Mixdown
Whenever you are mixing down or bouncing to disk and your destination bit depth is lower than 24-bit, insert a dither plug-in on a Master Fader that controls the output mix. You can use real-time dither plug-ins from Avid or third-party manufacturers.
For important information on using dither when mixing down or bouncing to disk, see Using Dither.
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For more information on Dither plug-ins, see the Audio Plug-Ins Guide.
Dither in Fades and Crossfades
In the Fades dialog (Edit > Fades > Create), the Use AudioSuite Dither option enables a preset, noise-shaped dither.
Dither on Export and Import
When you export audio to a lower bit depth, or when you import an audio file into a session that is at a lower bit depth than the file, a preset, noise-shaped dither is applied.
Dithered Mixer Plug-Ins (Pro Tools|HD Systems Only)
Avid has developed a mixer that provides all of the benefits of the standard Stereo Mixer and Surround Mixer plug-ins, but also provides uncorrelated dither on any summed output. There are two Mixer plug-ins that feature dither with noise shaping: Stereo Dithered Mixer and Surround Dithered Mixer.
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For more information on using the Dithered Mixer plug-ins, see the Pro Tools|HD User Guide.