REAPER is a digital audio workstation: a complete multitrack audio and MIDI recording, editing, processing, mixing, and mastering environment. Using your current computer and no other software, you can import any audio and MIDI, synthesize, sample, compose, arrange, edit, mix, and master songs or any other audio projects. If you add a hardware audio interface of your choice (AD/DA: analog-to-digital/digital-to-analog) and a microphone, you have a complete recording studio, suitable for recording anything from a soloist to a band to an orchestra (even if the orchestra is just you).
REAPER converts your computer into the full power of any top-of-the-line recording studio. Minus, of course, a room full of shockingly expensive converters, microphones, amplifiers, and, well, talent. If you are a top-of-the-line recording studio interested in REAPER, this part of the discussion has probably insulted your intelligence.

So we'll just say that unlike some other DAWs, REAPER will support almost any existing audio interface, even interfaces manufactured by companies whose software does not allow you to use any other hardware interface.

Fast, Powerful Editing:
• Drag and drop to import, arrange, and render
• Freely mix audio, MIDI, video, still image media on any track
• Easily move, split, glue, resize, trim, loop, time stretch, pitch shift, fade, crossfade, slip, snap to grid, without switching tools
• Intuitive zoom, scroll, scrub, jog, tab to audio transient, MIDI navigation
• Simple and powerful nested folder system allows group editing, routing, bussing, all in one step
• Full automation recording, playback, and editing support for track controls and plug-ins
• Easily manage tempo, time signature, and varispeed changes
• Separate audio or MIDI into freely arrangeable takes and lanes for easy comping
• Easily copy or move regions, to quickly try out alternate arrangements

Plug-in Support:
• Insert almost any third-party audio or MIDI plug-in: VST, VSTi, DX, DXi, AU (OSX only), JS
• ReWire (audio and MIDI) any capable application for even more flexibility
• Fully automatic plug-in delay compensation (PDC)
• Sidechain any plug-in, even if the plug-in does not natively support sidechaining
• Apply FX in real time, or non-destructively render FX output
• Real-time network FX processing: use other local machines as an FX farm

64-bit ReaPlugs Suite:
• Unlimited multiband EQ with draggable nodes
• Graphical FFT EQ/dynamics processing
• Technical and multiband compression
• Flexible, open-format convolution reverb
• Real-time pitch correction, with Elastique 2 Pro built in
• Multitap delay, basic synthesizer, sample player, vocoder, algorithmic reverb, and more
• Special-use plug-ins to virtualize outboard hardware, stream audio, connect to NINJAM servers, and more
• Includes the JS audio and midi plug-in scripting engine, and hundreds of user-programmable effects

Intangibles:
• REAPER starts and loads fast - be ready to record in just a few seconds
• Portable - put REAPER in your pocket and run it from a USB key or other removable media
• Tightly coded - installer is only a few MB, updates can be installed in less than a minute
• Rapid, efficient development - new features and optimizations are added quickly and often
• Very active, enthusiastic, and helpful user forum, get help quickly
• Fantastic and readable user-created manual
• An honest business model that aims to provide the best possible user experience

Changes in REAPER 3.14 - November 6, 2009:
* Action: show/hide all floating windows
* API: added functions for sending commands to the active MIDI editor window
* API: added register("command_id_lookup") to find extension actions
* API: added functions to retrieve track/take envelopes
* API: added MIDI_eventlist_Create, MIDI_eventlist_Destroy
* API: added GetSetTrackState, GetSetItemState, GetSetEnvelopeState
* API: fixed extension shortcut problem
* Automation: fixed action to set envelope lane fader from MIDI controller
* Automation: more consistent behavior for new envelopes picking up the fader value in non-trim mode
* Auto-crossfades: fix for some crossfades not being reset when moving multiple items across tracks
* Batch converter: new facility to convert media in bulk, optionally applying FX
* Custom menus: main MIDI menus can be customized, other improvements
* Custom menus: import/export/reset individual menus along with entire sets
* Custom toolbar: support adding extension actions to toolbar
* DX: fix for synths dropping the first MIDI note
* Live performance: FX multiprocessing optimization
* Media item resampling/pitch shift modes: not switched when switching projects
* MIDI editor: Fixed adding text/sysex events not extending source length when past end
* OSX: fixed issues with mouse focus in TCP
* OSX: nicer disk image
* OSX: various menu improvements/fixes
* OSX: preliminary video support
* OSX: alternate VST cache/path config for PPC vs Intel
* Peaks: fixed recording peaks interpolation accuracy and corner-case crash when recording
* Prefs/Media/MIDI: Improved behavior when all-notes-off when un-record-arming a track disabled
* Project/template file save: better detection and handling of failed disk writes
* ReaSamplomatic5000: Configurable per-instance resample mode
* Render queue: resizeable
* Track height: default for new projects can be set via File/Proj Settings/Save as default or Prefs/Projects/Default
* Track renaming: better support for tabbing through tracks when envelope panels visible
* Video: improved scrubbing support
* Video: handling of multiple items improved (later items, higher track numbers prioritized)
* Windows: Fixed font used in some dialogs for ClearType (OGG rendering, etc)

Homepage - http://www.reaper.fm