CLAP
do not apply plugin PDC/latency to MIDI events if the plugin produces MIDI output
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fix interpolating parameter values in first buffer block after playback start
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prevent adding duplicate parameter change events to event queue
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Command line
support passing reascript on command line, for example: 'reaper.exe projectfile.rpp scriptfile.lua'
support inserting media or running reascripts in already-running REAPER instance, for example: 'reaper.exe -nonewinst media.wav scriptfile.lua'
FX
improve anticipative FX scheduling to improve performance with slow media disks
improve performance of anticipative FX multiprocessing on folder tracks that use PDC
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improve performance of anticipative FX multiprocessing in various other routing contexts
macOS
add option in prefs/buffering/advanced to view or change open-file limit
support controlling existing instance of REAPER via command line (parity with other OSes)
FX Plug-in Embedding:Embed small versions of some plug-ins into your tracks control and mixer panels, including ReaEQ, ReaFIR, ReaXcomp, graphical JSFX plug-ins, and more
MIDI CC Envelopes:Handle MIDI CC data as continuous data envelopes, rather than discrete events; create smooth, musical articulations and effects
Auto-stretch Timebase:Automatically stretch and reconform audio around complex tempo changes; easily work with tempo-mapped and live-played recordings together
Routing Diagram:View and edit project routing using a high-level graphical patchbay emulation
Retina/HiDPI:Automatic rendering to HiDPI and Retina displays; new Default 6 theme supports 100%, 150% and 200% natively
Big Project Improvements:Vastly optimized behavior for projects with high (200+) track counts; Metal display support for massively faster screen drawing on newer macOS displays
..and More:New theme with extensive customizability via Tweaker script; Dynamic Split improvements; import and render media with embedded transient information; per-track positive or negative playback offset; faster and higher quality samplerate conversion; and many other fixes and improvements