Cockos has released version 2.5 of REAPER, featuring track control grouping, REX2 support, Dynamic Split interactive beat slicing, and a lot more. The Windows x64 Beta and Mac OS X Beta versions have also been updated.

Big Stuff:

• Uber track control group support (shift+G defaults to show group settings, Ctrl+Alt+G shows new Track Grouping Matrix).
• REX2 file support, imported slices keep beat location if project tempo changes (todo support moving items across tempo changes, currently slices must be re-imported).
• Dynamic Split interactive beat slicing and quantization.

New Goodies:

• Action: detect tempo, create measure from time selection (new or current time signature, one bar or many).
• Action: extend or swap selection to next transient in selected items.
• Action: move items left/right by grid.
• Action: set/adjust arrange view grid size.
• Action: move cursor to next/prior zero crossing (Z, shift+Z by default).
• Action: split item at prior zero crossing (alt+Z by default).
• Action: move cursor to nearest transient in selected items.
• Action: adjust item rate while clearing preserve pitch.
• Action: set/clear item "preserve pitch" setting.
• Action: select all tracks in groups 1.32.
• Action: create chromatic MIDI notes from selected items.
• Shift+3/4,5/6 now map to item rate changes (10-cent, semitone), clearing preserve pitch.
• JS: utility/volume_pan with parameter smoothing (for use with param modulation).
• JS: utility/phase_adjust now handles stereo (phase rotates each channel, not the stereo image).
• JS: delay_sustain effect.
• JS: vca_master and vca_slave for emulating VCA-style control using audio routing.
• JS: spectropaint effect, fixes to gfxanalyzer and gfxspectrograph.
• New mute and solo button context menus with toggle/exclusive/clear options.
• Add-FX dialog: remembers recent searches in dropdown list.
• MIDI editor: rename current MIDI take from MIDI editor menu.
• Option to disable alt key opening menus in main, midi editor, mixer windows.
• Render stem actions now render pre-fader signal, new actions for old post-fader stems behavior.
• Prefs/editing behavior: slider for tab-to-transient sensitivity.
• Glue: glues items to project samplerate if project samplerate is set.
• Routing matrix: fixed some scrollbar bugs, improved tooltips, added track grouping view.
• Saving a project with copy/move that has media loaded into ReaSamplomatic and ReaVerb now copies that media to project directory.
• Option in Prefs/Appearance to allow choosing track group display modes (ribbons, lines, none).

Subtle Improvements:

• Better pooling of media file resources for better RAM use (especially with lots of splits).
• Better automatic track naming, updating of UI on autoname.
• Better pooling of pitch shifter resources (track-pooled to avoid excess reinitializations).
• Undo system: reduced memory use throughout (better granularity etc).
• WavPack: updated to 4.50, fixed bug in metadata reading, BWF tag read/write.
• Recording volume/pan automation with ganged/grouped tracks is now supported.
• Better ganged/grouped vol/pan fader behavior (relative levels not lost at extremities).
• MIDI media items no longer reset CCs at end, just pitch and notes.
• ReaEQ: better deferred display updating, uses LICE bitmaps (todo: full LICE conversion).
• Removed excess ini file writing resizing midi editor CC lane.
• Removing presets in preset list now cleans up the preset file more.

Fixed Stuff:

• MCP: multiple track selection follows MCP track order and visibility.
• Shift+Click for time selection behaves better with snap and other options.
• Shift+Click for loop selection in ruler now works correctly when time+loop selections locked.
• Fixed touch automation on track mutes.
• Screenset window now updates shortcuts when using alternate recording section.
• Prefs/Keyboard is back, has link to actions window.
• Improved threadsafeness of media creation and peak cache system.
• Fixed relative grid actions in midi editor showing display.
• Fixed auto-add of envelope setting initial (t=0) value.
• Fixed crash on JS with only outputs and opening pin manager.
• Fixes for tab to transient and zero crossing detection for heavily stretched items.
• Improved behavior of preference to not allow projects to override audio hardware sample rate.
• Fix for ReaNINJAM problems introduced in 2.45 (ogg end of stream behavior).
• Fixed GDI leak in ReaEQ added in 2.42 (nyquist line drawing).
• Fixed GDI leak in skinned-scrollbar code.
• Restore MIDI editor note row display state when reopening a project.
• AU: update generic UI on factory default preset loading.
• Fix for JS with only outputs crashing when plugin pin matrix opened.
• Fix for preset system storing large presets (ini file line size issue).
• Fix for parameter modulation/automation reading when "run fx when stopped" is disabled.
• Moved many JS fx from old_unsupported back to their authors path.