Pro Tools 202170

Introduced in 2021.6, Audio-to-MIDI got refined in 2021.7 with better pitch detection and note timing. You could now drag an audio clip onto a MIDI/Instrument track, and Pro Tools would analyze monophonic material (vocals, bass, flute, etc.) and generate corresponding MIDI notes.

Real-world use:
Turn a scatted vocal hook into a synth lead; extract a bassline from a recorded DI track for re-amping via virtual instruments.

Pro Tools 2021.7 is a full-featured release from Avid, arriving roughly two months after 2021.6. Version numbers follow the pattern YYYY.M (where M = month). Thus:

Crucially, 2021.7 required an iLok authorization and was available to all active subscribers (Pro Tools Artist, Studio, and Ultimate) as well as perpetual license holders with current Update + Support Plans.

"2021.7 is the first version since 2020.11 that I trust for a 5.1 film dub. No crashes in 12 hours." "Hybrid Engine made my HDX card feel new again. I stopped looking at UAD Apollo alternatives."

While not as flashy as the Hybrid Engine, 2021.7 added two workflow features that post-production houses demanded. pro tools 202170

If you meant 2021.10 (October 2021 release), that added:

Could you clarify which specific feature you're asking about? For example:

Let me know, and I’ll give you a detailed answer!

Pro Tools 2021.7 is a maintenance update released by Avid on August 5, 2021, primarily focused on performance stability, bug fixes, and workflow refinements following the major feature additions of version 2021.6.  Key Highlights of the 2021.7 Update 

Video Engine Improvements: Sessions containing numerous video files now open significantly faster. Additionally, the Video Engine can be enabled on non-admin accounts without requiring a prior admin login. Introduced in 2021

macOS Stability: Fixed several critical crashes on macOS, including a "Spinning Wheel of Death" (SWOD) issue identified in 2021.6 and crashes when importing specific video files on macOS Mojave.

Windows Performance: Addressed issues on Windows machines using Intel Ice Lake processors, allowing for smoother media uploads and downloads for Cloud Projects.

UI Fixes: Resolved permissions issues that prevented saving Color Palette presets on macOS and fixed visual bugs like white borders appearing on certain dialogs in non-English languages.  Essential Technical Specs 

Installation: Version 2021.7 is a full installer, meaning you do not need a previous version of Pro Tools installed to use it.

Licensing: Your iLok license must have a "Release Limit" date of August 6, 2021, or later to run this version. Crucially, 2021

Single Installer: A unified installer is used for both standard Pro Tools and Pro Tools Ultimate; the software's capabilities are determined solely by your iLok authorization.  Key Context from 2021.6 (The Major Preceding Update) 

Since 2021.7 is a maintenance patch for the 2021.6 cycle, it inherits these major mid-2021 features: 

HDX Hybrid Engine: Allows HDX users to toggle between DSP and Native processing for lower latency during tracking.

Increased Track Counts: Standard Pro Tools tracks were doubled to 256, while Ultimate users received up to 2,048 voices.

Expanded I/O: Support for up to 64 channels of I/O for third-party Core Audio and ASIO devices.

Dark/Classic Theme Switching: The ability to switch UI themes instantly without restarting the application. 

For full compatibility details, you can consult the official Pro Tools Operating System Compatibility Chart on the Avid Knowledge Base.