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Author: Admin | 2025-04-27
Line of PCIe cards, called HD Native, provided low latency with a single FPGA chip but did not mount DSP (audio processing relied on the host system's CPU).[65] Round trip latency at 96 kHz was 0.7 ms for HDX and 1.7 ms for HD Native (with a 64-sample buffer).[66]To maintain performance consistency, HDX products were specified with a fixed maximum number of voices (each voice representing a monophonic channel). Each HDX card enabled 256 simultaneous voices at 44.1/48 kHz; voice count halved when the sample rate doubled (128 voices at 88.2/96 kHz, 64 voices at 176.4/192 kHz). Up to three HDX cards could be installed on a single system for a maximum of 768/384/192 total voices and for increased processing power. On Native systems, voice count was limited to 96/48/24 voices with the standard version of Pro Tools and 256/128/64 voices with Pro Tools HD software.[4]With Pro Tools 10, Avid deployed a new plug-in format for both Native and HDX systems called AAX (an acronym for Avid Audio eXtension).[67] AAX Native replaced RTAS plug-ins and AAX DSP, a specific format running on HDX systems, replaced TDM plug-ins. AAX was developed to provide the future implementation of 64-bit plug-ins, although 32-bit versions of AAX were still used in Pro Tools 10. TDM support was dropped with HDX,[68] while Pro Tools 10 would be the final release for Pro Tools | HD Process and Accel systems.Notable software features introduced with Pro Tools 10 were editable clip-based gain automation (Clip gain), the ability to load the session's audio data into RAM to improve transport responsiveness (Disk caching), quadrupled Automatic Delay Compensation length, audio fades processed in real-time, timeline length extended to 24 hours, support for 32-bit float audio and mixed audio formats within the session, and the addition of Avid Channel Strip plug-in
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