• ACID
• AIFF
• APE
• AVI
• BWF
• CDDA
• EDL
• FLAC
• KAR
• MIDI
• MOGG
• MOV
• MP3
• MPEG
• OGG
• QT
• RADAR session
• REX2
• SYX
• W64
• WAV
• WAVPACK
• WMV

• AIFF
• APE
• BWF
• CD ISO (CUE/BIN)
• FLAC
• MIDI
• MOGG
• MP3
  (with freely available encoder)
• OGG
• W64
• WAV
• WAVPACK

WAV/BWF/W64:

• 8/16/24 PCM
• 32/64 FP
• 2/4 ADPCM

AIFF:

• 8/16/24/32 PCM

WAVPACK:

• 16/24 PCM
• 32 FP

FLAC, APE:

• 16/24 PCM

• any

• Record arm/disarm tracks on the fly
• Time selection auto-punch
• Selected media item auto-punch
• Tape-style varispeed recording

• Audio input
• MIDI input
• MIDI overdub
• MIDI replace
• MIDI touch-replace
• Track audio output (mono, stereo, or multichannel)
• Track audio output, latency-compensated
• Track MIDI output
• Input FX: monitor MIDI, record audio, or vice versa or any variation

• ReaEQ  Unlimited multiband EQ, with selectable filter types and intuitive graphical interface, and FFT frequency display.
• ReaComp  Highly configurable compressor, with sidechain, lookahead, knee, customizable detector window and filters, feedback mode. ReaComp can be tweaked to sound like many popular hardware and software compressors.
• ReaXComp  Unlimited multiband compressor, with per-band configurable threshold, knee, attack/release, window size. A fast and clean interface for the abusive squishing of audio.
• ReaDelay  Unlimited multitap delay, with customizable filters, resolution control, tempo sync, musical or time-based delay, and more.
• ReaPitch  Multivoice pitch shifting and pitch correction, with an unlimited number of individual shifters.
• ReaTune  Powerful automatic or manual pitch correction, with intuitive graphical interface, MIDI note output, and histogram for technical instrument tuning tasks.
• ReaVoice  MIDI-controlled multivoice pitch shifter.
• ReaFIR  Graphical FFT-based EQ and dynamics processing, a flexible tool for surgical EQ/compression, noise gating, and more.
• ReaGate  Sidechainable noise gate, with lookahead and hysteresis, and MIDI trigger output for easy hit replacement.
• ReaVerb  Convolution reverb engine that can synthesize, load, and manipulate impulse responses on the fly.
• ReaVerbate  Simple and efficient algorithmic reverb.
• ReaVocode  A basic vocoder.
• ReaSynth  A basic, efficient synthesizer, with mixable oscillator shapes and pulse width modulation.
• ReaSamplOmatic5000  A MIDI-triggered sample player.
• ReaSynDr  A tiny, old-school style algorithmic drum synthesizer.
• ReaSurround  A fast, powerful, highly configurable surround panner.

ReaPitch, ReaTune, and ReaVoice can be driven by any of REAPER's included pitch shifting engines, including Elastique 2 Pro.

• ReaControlMIDI  Flexible MIDI track controls that can be inserted anywhere in the signal chain, with full sysex support, fully automatable bank/program select and control change envelopes.
• ReaInsert  Insert external hardware effects as if they were plug-ins, including ping-calculated PDC.
• ReaNINJAM  Connect to NINJAM servers, to use your own real or virtual instruments for real jams with other musicians all over the world.
• ReaStream  Stream audio and MIDI over the network to other instances of REAPER.

• Highest quality 64-bit audio processing, sample-accurate MIDI processing.
• Resolution, accuracy, and processing capabilities are identical to any commercial plug-in.
• Hundreds of JS plug-ins included with REAPER, including JS versions of real commercial plug-ins.
• Fully user-scriptable, edit existing plug-ins or create your own from scratch.
• Create and edit plug-ins on the fly, without interrupting audio playback.
• JS editor and debugger included, opens automatically when you edit a plug-in.
• Create plug-ins for anything: typical audio effects, utility tasks, one-offs, even visualizations and games.
• Hundreds more user-created plugins available on the REAPER user forum and resource stash.

• Use spare machines on your local network as a real-time FX farm.
• Minimal latency on wired networks, you can even run virtual instruments remotely and monitor locally.
• Run entire FX chains remotely to reduce bandwidth.
• Run multiple slave machines transparently from a single host.
• Get the most out of your old hardware, even a tired old laptop can host a single reverb.

• Windows 2000/XP/Vista/7/8
• OSX 10.4/10.5/10.6/10.7/10.8
• Linux/WINE
• Windows 98/ME (limited)

• ASIO
• Core Audio
• WDM Kernel Streaming
• WaveOut
• DirectSound
• WASAPI

Supports almost any audio or MIDI sound card or interface.

• VST, VSTi
• DX, DXi
• AU (OSX only)
• ReWire
• JS (user-scriptable plugins)

• Fully automatic plug-in delay compensation (PDC)
• 64-bit plug-in IO
• MIDI plug-in support
• Host tempo sync and timeline callbacks
• Insert and chain plug-ins on tracks and individual media items
• Insert external hardware as FX, with ping-calculated PDC
• User-scriptable JS plug-in engine included
• ReaMote real-time network FX processing included

• ReWire
  (audio and MIDI, master or slave)
• ReaRoute
  (between ASIO applications)
• ReaInsert
  (virtualize external hardware)
• MIDI sync options
  (MTC, SPP+clock, SMPTE LTC, all master or slave)
• Open Sound Control
  (fully configurable for linking with other hardware and/or software)

Built-in support:

• BCF2000
• TranzPort
• AlphaTrack
• FaderPort
• Baby HUI
• MCU
• Automap 3.0
• Joystick support

Configurable MIDI assignment for most track/transport controls, all plug-in controls, and any action or custom action.

Open control surface API, user-created extensions available for other control surfaces.