Sound Designers

Video

massive improvements to video support
allow user configurable video decoder priorities with per-file-extension controls
configurable video output display latency
dockable video window
per-source option to not decode audio for video files
pooled audio decoders, reducing RAM use for heavily edited videos
project framerate is used instead of media framerate to determine display timing
projects can now specify preferred video width/height/colorspace, resizing options
real-time programmable (EEL) effect processors insertable as track and item FX
support for AVFoundation video encoding/decoding on OSX 10.7+

FX

per-take FX automation and MIDI learn support
browser smart folders (filter-folders)
browser options to view JSFX by description and/or filename
support for parameters with inverted ranges
VST3 support, including sample-accurate automation
inform VST plug-ins of offline rendering state, by default
duplicating Take FX copies channel counts
user-adjustable parameter modulation LFO phase

Media Explorer

added option 'Play through selected track'
search in subfolders
improved accessibility/tabbing navigation
fixed various UTF-8 issues on Windows ..
fixed issues when using preserve-pitch and tempo-match options
fixed MIDI/OSC action binding

ReaScript

integrated development environment (IDE) for running, editing, debugging scripts
IDE supports syntax highlighting, multiple editing panes, watch lists, structure matching, and more
integrated Lua 5.3 scripting support
EEL and Lua scripts can query various information (incl. MIDI/OSC input values) via get_action_context()
EEL/Lua graphics/UI API (gfx*) extensions
toggle state support (script toolbar buttons can have on/off states)

Automation

increased automation recording speed by 3x
internal changes and performance improvements to FX parameter automation
more consistent behavior when changing FX preset
new volume envelope mode that mimics track fader scaling

JSFX

sample-accurate automation support
added support for inverted slider ranges
editor improvements (scrollbars, multiple editing panes, Ctrl+Mousewheel font size change)
fixed potential crash from gfx_circle() with bad parameters .

Multichannel media

support Ambisonic WAVE_FORMAT_EXTENSIBLE .wav files
improved zero crossing navigation
improved tab-to-transient behavior
improved support for chained OGG Vorbis files

Default theme

extra fancy new theme
many layout choices for different uses (small, large, meters, live recording, media, item)
better track panel and item tinting appearance

Localization

language packs can specify scale for dialog windows using (for example) 5CA1E00000000000=xsc ysc
all codec (wav, video, mp3, etc) dialog boxes and related strings can now be translated
new template LangPack

Metronome

configurable beat patterns
improved count-in behavior/quality

MIDI

do not automatically enable MIDI vol/pan faders when creating MIDI-only sends/receives .
note-off velocity support in piano roll and list view editors

MIDI editor

added mouse modifiers to edit note edges ignoring selection
changed default note edge mouse modifiers to match default media item edge modifiers
optionally display project tempo and time signature markers in the ruler

Performance

updated default worker thread scheduling logic for lower CPU use
disabled anticipative FX processing on tracks with open MIDI editors, by default
automatically disable anticipative FX in routed-to tracks for open MIDI editors

Project Bay

new tab for managing FX parameter envelopes, modulation, and MIDI learn
fixed replace FX in project .
fixed source/item/fx deletion and undo issues .

ReaPlugs

improved touch-automation behavior for various check/combo/edit controls
improved ReaInsert behavior in many real world scenarios (PDC, looping, heavy load)

Ruler

improved display for frame grid and HH:MM:SS:FF
absolute frames time display mode

Theming

added theme tweak window (and removed outdated preferences pane)
improved theme color tinting support (requires 'version 5' in rtconfig, themes can override tint/peaks preferences via rtconfig 'tinttcp' and 'peaksedges')
scrollbar_2 and scrollbar_3 images can override scrollbar images for arrange and MIDI editor respectively

Time Map

better behavior when changing time signatures
improved behavior when inserting/removing time in project (fixed auto-create of new time signature markers)
improved time signature behavior when moving/copying regions

Undo

options to include envelope point selection in undo state
improved FX envelope undo behavior

Actions

added propagate take and propagate item actions

ASIO

support for up to 512 channels of input and output

Configuration import/export

optionally include media explorer databases

EDL

support for VIDEO media type in Vegas EDL TXT

Mouse

ignore mouse wheel on all faders, by default

Opus support

full decode/encode support for OGG Opus files

Ripple editing

removing time in one-track and all-track mode better respects timebase:beats preferences for markers, items, and envelopes

Stretch Markers

improved behavior when changing tempo map/moving items across tempo maps

Toolbars

up to 16 general and 8 MIDI toolbars

Track grouping

VCA slave track group setting

Windows

fixed color picker potentially appearing offscreen

API

added Envelope, Tempo Map, Project Extension State, improved MIDI and Toolbar APIs