REAPER 5.9.8.0 (64-bit)

What's new in this version:

Envelopes:
- don't preserve relative differences between points when editing via action
- fix inconsistency when loading projects with bezier envelope points
- fix time selection edits that start at the beginning of a media item
- improve UI performance when recording send volume/pan automation

Render:
- add option to render selected tracks via master
- improve use of $item wildcard when rendering project regions
- support $item and $track wildcards when rendering selected media items via master
- when rendering selected tracks or media items via master, also render children and receives

FX:
- fix potential crash on macOS/Linux when auto-switching visible FX chain
- fix ReaTune per-take FX tail issue

macOS:
- fix system Services menu
- use standard Window/Help menu ordering
- add osx_max_open_files= reaper.ini tweak

MIDI editor:
- handle converting multiple selected events between 2-byte and 3-byte messages
- support copy/pasting events between CC lanes and channel pressure lane

Mouse modifiers:
- fix preference to ignore targeting media item lower half
- improve handling of empty take lanes when targeting media item lower half

Notation editor:
- fix chasing key signature changes when displaying multiple tracks
- fix chasing clef changes when media items overlap

Peaks:
- do not set all media online after building peaks
- fix bug in waveform drawing with some themes and settings (5.979 regression)

Performance:
- improve low-latency behavior by avoiding destroying media buffers from audio threads
- fix live FX multiprocessing issue with folder tracks causing media buffer underruns
- reduce audio device underruns when pausing

ReaScript:
- simplify display of line numbers in IDE error messages
- improve Python compatibility with unicode strings

VST:
 -limit preset dropdown to 512 presets of each type
 -improve support for VST3 MIDI program change messages

ARA:
- handle ARA state load error without interfering with extension state loading

Arrange view:
- avoid excessive redraws during some mouse edits

Jump to time:
- add support for jumping to relative time in earliest selected media item

Localization:
- improve alignment of various auto-resized controls when arranged in columns

Media items:
- add optional per-item ruler display

Mixer:
- fix slowness when opening mixer

Nudge:
- fix issue with calling nudge-by-settings-slot before opening nudge window

Ruler:
- in frame mode, display one tick mark per frame when possible

Toolbars:
- improve automatic button images for various Set: actions