Mixing : Plug-In and Hardware Inserts : Plug-In Inserts : Plug-In Formats

Plug-In Formats
There are four plug-in formats supported by Pro Tools (AAX, TDM, RTAS, and AudioSuite), three of which can be used as real-time inserts, as follows:
TDM Plug-Ins
Provide real-time plug-in processing using dedicated DSP processing with Pro Tools|HD systems. TDM plug-in files use the “.dpm” file suffix.
AAX (Avid Audio Extension) Plug-Ins
Provide real-time plug-in processing using host-based (“Native”) processing or DSP-based (“DSP”) processing (Avid HDX systems only). The AAX plug-in format also supports AudioSuite non-real-time, file-based rendered processing. AAX plug-in files use the “.aax” file suffix.
RTAS (Real Time Audio Suite) Plug-Ins
Provide real-time plug-in processing using host-based (“Native”) processing. RTAS plug-in files use the “.dpm” file suffix.
AudioSuite Plug-Ins
Provide non-real-time (rendered), file-based processing plug-ins for Pro Tools. AudioSuite plug-in files may use either the “.aax” or “.dpm” file suffix.
Depending on your Pro Tools software, real-time plug-ins can be used as follows:
Avid HDX Systems
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AAX (DSP and host-based) and RTAS plug-ins can be used on audio, Auxiliary Input, Master Fader, and Instrument tracks.
Pro Tools|HD Systems
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AAX (host-based only), TDM, and RTAS plug-ins can be used on audio, Auxiliary Input, Master Fader, and Instrument tracks.
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With Avid HDX and Pro Tools|HD systems, Native (AAX and RTAS) plug-ins on Auxiliary Input, Master Fader, and Instrument tracks use additional voices and may introduce extra latency based on the HW Buffer Size. See Voice Usage and Total Latency for Native (Host-Based) Plug-Ins.
Pro Tools Host-Based Systems
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AAX (host-based only) and RTAS plug-ins can be used on audio, Auxiliary Input, Master Fader, and Instrument tracks.