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REAPER is a powerful but sensible Windows application designed for the recording, arrangement, editing, mixing and rendering of audio. REAPER provides a flexible but easy to use interface that is equally suited to amateurs and professionals alike.

REAPER is a small and lightweight application (the installer is less than 1 megabyte, which includes many effects and a sample project). REAPER is designed with both processing and user interaction speed in mind.

Basic features:

• Support for an unlimited number of audio tracks.
• Audio tracks are all fully routable (multiple inputs, outputs).
• Volume, pan controls and envelopes per track.
• Supports audio processing plug-ins (DirectX, DXi, VST, VSTi, and Jesusonic) with automation, easy chain manipulation and editing.
• Pitch shifting and time stretching.
• Fast, reasonable and usable Windows-style UI, working well on both low and high resolutions or multiple monitors.
• ASIO, Kernel Streaming, WaveOut, and DirectSound support for playback and recording.
• Reads WAV, OGG, MP3 and MIDI files, records WAV and MIDI files.
• Can render to WAV, OGG, MP3 if lame is installed.
• Full SMP support (can utilize 2 or more processors).
• Multi-layer undo/redo support.
• User creatable color themes.

Advanced features:

• Unlimited send/receives per track, with configurable parameters (pre-fx, post-fx, volume/pan adjustment/envelopes, mix to mono, phase, etc.).
• Any track can act as a bus, for routing flexibility.
• Tracks can have one or more (mono or stereo) hardware sends, for analog mixing capability.
• Fully routable/FX-able folder tracks that can contain group tracks.
• Item grouping.
• Ripple editing.
• Grid/snap support with configurable options.
• Markers.
• Unlimited takes per media item.
• Auto punch-in/punch-out functionality.
• Automatic record monitoring modes.
• Selection length granularity options as well as grid snapping.
• Tempo envelope (for grid lines/snapping/ruler), play-speed envelope.
• Project consolidation/export options (for rendering all or parts of any number of tracks to WAV, etc.).
• A UI and architecture that allows you to easily cut loops of many tracks simultaneously, without having to write them to disk.
• Support for plug-in generated media (such as click tracks, etc.).
• Project tempo envelopes for variable tempos in track, grid/snapping that supports variable tempos.
• 64-bit floating point sample pipeline for high quality.
• Advanced recording and monitoring options; examples:
  - You can route multiple tracks (inputs and/or media items) into a bus, and record THAT mixed down version.
  - You can record the input signal, or record the post-FX, post-track-render signal.
  - You can switch recording sources on the fly, even while recording.
  - You can arm/disarm tracks' inputs while playing or recording.

Other features:

• Human readable, human editable, backwards and forwards compatible project file format.
• Options to build peaks for recorded files on the fly.
• Lots of control for the user to specify where recorded files go, etc., when dealing with many projects.
• Template support to make it easy to load a project template and save it as a new project when you begin.
• Input/output channel name aliasing (why view your inputs as "MOTU 896: Analog 1" when you could have them be "Vocal Mic", etc.).
• Options for automatically backing up project files to alternate paths, time-stamped versions, etc.

New in v2.51

• JS: new development environment with editor, debugging support (variable watches).
• Saving track templates now saves any track media items as well (since people seem to want this).
• Loading track templates, fx chains, presets, now prompts for missing media (if REAPER is configured to do so).
• Action: move cursor back or forward one beat or measure, move cursor to start of this or next measure.
• Move to start of current measure action moves back a measure if cursor is already at measure start.
• Create measure from selection actions optionally set project tempo instead of inserting markers.
• REX2: adjust imported slice length to hear the longest tail of previous slices underneath later slices.
• JS: better UI auto-sizing/arrangement.
• JS: MIDI/midi_CC_mapper, updates to spectropaint, added spectropaint_filter.
• OSX: fixed keyboard focus issue on many actions.
• OSX: fixed bug with screensets window (could also affect win32).
• OSX: fixed keyboard state loading bug (required manually removing some key assignments -- could also affect win32).
• Vegas EDL: load/save of fade shapes, lock state, preserve pitch state, loading of mute state.
• ReaSynDr: fixed non-multiout mode.
• Fixed crashes when MIDI files are not found and ignored on project load.
• Fixed project start time offset when rendering cues.
• Fixed FX-add recent search combobox height.
• Fiddly fixes for zero crossing navigation with high frequency content.