| | Di seguito sono consultabili le note di rilascio - in gergo "release notes" - relative al file Reaper 4.0, nel caso in cui gli sviluppatori abbiano reso disponibile tale documentazione in occasione della pubblicazione del software. Tuttavia, se hai bisogno di maggiori informazioni su Reaper 4.0, o se le note di rilascio non sono (ancora) disponibili, è comunque possibile procedere con la lettura della descrizione del file. | 
 
 
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MIDI editing:
         
          
 Set user-definable scales and chords in the MIDI editor for drawing and editing notes
          
 Using mouse modifiers, copy/duplicate/paste actions can create pooled (ghosted) in-project MIDI source data
          
 Editing any pooled MIDI media item affects all media items that share the same pooled data
          
 Un-pool shared MIDI by gluing the media item or via MIDI source properties dialog
          
 New MIDI Contents menu for switching MIDI editor between different MIDI media items in the project
          
 MIDI filter improvements when displaying multiple media items in the same editor
          
 Many new mouse modifier behaviors to paint notes and chords, edit arpeggios, etc
          
Mouse modifier customization:
         
          
 Customize mouse behavior when using keyboard modifiers in 40 different contexts
          
 In many contexts, mouse click and mouse drag can be customized separately
          
 Assign different behaviors to the mouse when over the top or bottom half of a media item
          
 Assign any action (including custom actions) to mouse click or double-click in most contexts
          
 Existing/legacy mouse preferences are preserved, but user changes to mousemap settings will override
          
 Actions to reassign default mouse action for any context
          
Theme layout support:
         
          
 Fully themeable UI, allowing repositioning/removal/addition of UI elements
          
 Per-track TCP/MCP layout support
          
 Screensets support saving/restoring layouts
          
 Old themes use default layouts available in Plugins/default_layouts.txt
          
 New themes can define their own layouts
          
 Layouts can be switched via menu, screensets/layouts dialog, or customizable actions
          
Media Explorer:
         
          
 Select a portion of a media file to insert into a project
          
 Optionally loop and/or stretch the selected portion to fit the destination area and tempo
          
 Scroll and zoom the media peaks preview
          
 Control+alt drag the time selection to render a new cropped file to REAPER, the desktop, or a folder
          
 Control+alt drag the time selection to sampler plugins or other applications that support drag/drop
          
Project Bay:
         
          
 Manage, preview, search, replace project source media, media items, and FX
          
 Manage media item groups and take comps for the project
          
 Save/load project bay contents to create working sets of source media/FX for different purposes
          
 Store sets of edited media items (including fades, stretch, pitch shift, etc) to use in any project
          
 Media and FX+preset combinations can be stored, inserted, and switched in the project
          
ReaSurround:
         
          
 Multi-channel surround panner with support for any number of input channels and speakers
          
 Freely position input sources and speakers in 3D space
          
 Configurable per-channel diffusion (treat input source audio as a shaped area rather than a point)
          
 Drag track IO button to ReaSurround to add new input sources
          
Take lanes and comping:
         
          
 Take lanes remain aligned by recording pass, creating empty lanes as needed (optional)
          
 Each recording pass gets its own take lane, even when recording overlaps existing items
          
 Recording no longer splits existing media items into different numbers of take lanes
          
 Save/load named comps (sets of takes from multiple media items)
          
 A/B or cycle through saved comps to audition/compare
          
Dockers and toolbars:
         
          
 Multiple dockers, freely dockable in main window or floatable (up to 16 separate dockers/toolbars)
          
 Drag tabs from a docker to rearrange tabs, create a new docker in another location, or float windows
          
 Create, customize, and freely dock or float toolbars for different uses
          
Envelope editing:
         
          
 Support for copying envelope points with the mouse
          
 Groups of selected points act like contiguous items when moving or copying
          
 Shift+control+drag on envelope segment (customizable) edits the envelope level within the time selection
          
Media Item Properties:
         
          
 Item/Take Properties dialog stays open while you work elsewhere, follows changes in selected items
          
 Pitch adjust and playrate fields accept values (such as "1.004") or simple operations (such as "x2")
          
Multichannel support:
         
          
 Allow choosing greater than 2 channels of sequential inputs, monitoring inputs
          
 Multichannel track meters
          
 Freely route any number of track channels to other tracks, hardware outputs
          
Render and batch-convert:
         
          
 Support for rendering project tracks and time regions to separate folders and files
          
 Customizable wildcards provide great flexibility in naming batches of rendered/converted files
          
 Save render presets for workflow efficiency
          
Time selection:
         
          
 Default copy/cut/glue actions respect time selection if there is one (including leading/trailing space)
          
 Using mouse modifiers, copy/move behaviors can respect time selection if there is one
          
 Editing behavior can be customized separately for media items, envelope points, MIDI editing
          
Track input FX chains:
         
          
 FX in the input FX chain only run when record armed, and only affect the signal coming in
          
 use MIDI or audio input, and can be set to output MIDI or audio independent of the input format
          
Track pan improvements:
         
          
 Track stereo width controls and envelopes
          
 Configurable track pan modes: balance, stereo pan (L/R + width), dual pan, and classic (3.x) balance
          
Pitch shift envelopes:  Each take has its own pitch shift envelope, including customized range and snap settings
        
Transient detection and dynamic split:  separate threshold and sensitivity settings, and other options
        
Video:  performance improvements, support for sequencing still images
        
Volume faders:  new default hardware-emulation fader taper
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