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