REAPER 6.65 (64-bit)

What's new in this version:

Pan:
- explicitly support sine taper, linear taper, and hybrid taper pan functions
- special case -3dB and -6dB pan laws to be exactly equivalent to constant power (-3.01..dB) and constant gain (-6.02..dB); preserve existing settings in existing projects
- fix implementation of hybrid taper pan law when applying gain compensation
- document ReaScript/API settings for pan law flags
- simplify pan law preferences
- fix pan function evaluation when playback is stopped
- improve calculation of hybrid taper pan law with certain manually entered pan laws (thanks ErBird)
- only list deprecated pan mode in pan law dialog if the project already has pan mode set that way

FX:
- add option to use space key to start/stop transport in plug-in text edit fields
- add oversample options to floating FX window context menu
- fix generic UI when last parameter is an enum
- improve syncing displayed value in generic UI
- optimize performance with many docked-but-invisible FX chains
- when changing compatibility settings, update all matching FX instances
- encode envelopes name in project file, for use when loading with FX offline

VST:
- fix return value for IContextInfoProvider::setContextInfoValue
- add IContextInfoProvider3 support
- support IComponentHandler2::setDirty
- improve space key behavior with various plug-ins (e.g. Softube)

FX browser:
- allow configuring defaults per-plugin of want-all-keyboard, TCP/MCP embedding, and oversampling
- move compatibility settings to submenu

Routing/Grouping/Render Matrix:
- dynamically adjust margins to fit text
- add context-specific help, accessible via the (?) button

Theme:
- fix 3 small issues
- fix mixer send knob 150%-scaled image

Audio Units:
- fix support for AUv3 musical time/tempo/transport state callbacks

Automation items:
- fix behavior of action to split automation items without changing selection

Configuration files:
- fix various issues for FX shortcut/safemode/etc settings on plug-ins/themes with odd filenames

Envelope window:
- improve appearance of scrollbars with retina displays

Grouping Matrix:
- right-click in grouping matrix opens group settings dialog for already-selected tracks, rather than auto-selecting tracks

Linux:
- improve behavior of text edit fields with control-key shortcuts

macOS:
- support decoding .rx2 files on native Apple Silicon

Media:
- sort Insert Media file description/extension dropdown list in alphabetical order

Media Explorer:
- support typing in preview volume

Media items:
- fix flickering when moving media items across tracks and "automatically display affected envelopes" is enabled

MIDI Editor:
- actions to move edit cursor by grid respect snap settings

Mouse modifiers:
- add razor edit mouse modifier to move or tilt envelope (fine adjustment)

Razor edits:
- ignore razor edit areas on envelopes when running action to crossfade media items

ReaGate:
- implement string-to-parameter conversion for threshold

ReaLimit:
- fix continuous automation recording
- Region/Marker Manager
- fix display glitch when resizing window

Render:
- add post-render button to display rendered file in Media Explorer

WALTER:
- fix h (height) variable in tcp.fxembed context

Windows:
- improve alt-key behavior relating to menu activation and cursor updating