REAPER 6.57 (64-bit)

What's new in this version:

Timestretch:
- add new Rrreeaaa (polyphase synthesis) stretching mode, useful for artistic stretches

Video:
- support native decoding and rendering of .wma, .wmv, and mpeg-4 audio/video via Windows Media Foundation
- support embedding FLAC audio in WMF-encoded MP4/M4V (Windows 10 and later)
- improve performance when using video-only or audio-only media
- support encoding audio-only or video-only files with ffmpeg
- update Grid of Videos preset
- deprecate DirectShow video decode mode, must be manually re-enabled in preferences

Media items:
- actions to activate previous/next/etc take do not affect locked media items
- allow opening and editing per-take FX on locked media items, but not alt/opt+click to delete all FX
- allow vertical autoscroll when moving/copying items using certain customized mouse modifiers
- fix take marker display with certain zoom settings
- improve interaction between item height preferences when using free item positioning

Razor edits:
- fix editing bug when razor edit contains MIDI items in project with timebase time and partial measures
- simplify display of pre-edited razor edit areas
- add mouse modifiers to move areas disabling or temporarily enabling ripple edit
- fix mouse-position-dependent snapping

Render:
- fix issues with peaks and dither when channel counts are conformed by output (e.g. multichannel forced to stereo by CD or DDP render)
- respect option to add rendered files to project when preference enabled to return to render settings window after render
- support rendering to mp3 (as primary or secondary output) when processing at sample rates higher than 48k
- when rendering selected regions, if no regions are selected, render all regions
- improve error message details

Appearance:
- add separate preferences for drawing labels above media items, and hiding media item labels, at specific media item heights
- do not draw media item labels above the item if the item would be smaller than the label

FX:
- zero out PDC-compensated FX delay samples
- show combined oversample rate in chain view when both chain and instance oversampling are used

macOS:
- add gen_vol*_dark and gen_pan*_dark theme elements for macOS dark mode
- fix horizontal mouse drag on mixer send controls

MIDI editor:
- improve behavior of mouse modifier to delete all touched notes when moving the mouse quickly
- support loading raw sysex from file in sysex edit window
use fixed-width font for sysex edit window

Performance:
- reduce realtime CPU use when repositioning edit cursor with playback stopped
- improve recovery from media buffering underruns when using heavy per-item processing

Recent projects:
- add option to display customized project title (set in Project Settings/Notes) in recent projects menu and prompt
- add option to display either file part or full path in list

Drag and drop:
- improve preview display when dragging to insert-new-track area

Drawing:
- improve drawing performance with thousands of very small items (6.54 performance regression)

FX browser:
- allow removing LV2-created categories

lv2:
- support URL encoded filesystem specifications

Media explorer:
- do not try to copy directories via drag/drop

Notation editor:
- improve positioning of accidentals in chords

Opus:
- ensure all samples are flushed to file when rendering at sample rates other than 48k

Peaks:
- fix various sample-level view glitches

Preferences:
- include more information/help in video decoder details window

ReaScript:
- increase precision of razor edit start/end position as returned by GetSetMediaTrackInfo("P_RAZOREDITS")

Theme:
- add theme elements for inactive takes, applied separately from elements for muted/not-soloed tracks/items

Undo:
- improve undo behavior for actions/scripts that did not previously set the correct undo flags

VST3:
- clear all parameter info on kParamTitlesChanged

WALTER:
- allow specifying mcp.extmixer and master.mcp.extmixer to front command