REAPER позволяет применять во время обработки аудио множество эффектов, поддерживает технологии ASIO, Kernel Streaming, WaveOut и DirectSound воспроизведение и запись. Поддерживает работу с файлами в форматах WAV, OGG, MP3, MIDI (чтение) и WAV, MIDI (запись), управление уровнем громкости, изменение границ трека, допускает многоуровневый откат/повтор выполненных операций и многое другое.
Basic features: * Portable - supports running from USB keys or other removable media
* 64 bit audio engine
* Excellent low-latency performance
* Multiprocessor capable
* Direct multi-track recording to many formats including WAV/BWF/W64, AIFF, WavPack, FLAC, OGG, and MIDI.
* Extremely flexible routing
* Fast, tool-less editing
* Supports a wide range of hardware (nearly any audio interface, outboard hardware, many control surfaces)
* Support for VST, VSTi, DX, DXi effects
* ReaPlugs: high quality 64 bit effect suite
* Tightly coded - installer is just over 2MB Editing features: * Tool-less mouse interface -- spend less time clicking
* Drag and drop files to instantly import them into a project
* Support for mixing any combination of file type/samplerate/bit depth on each track
* Easily split, move, and resize items
* Each item has easily manipulated fades and volume
* Tab to transient support
* Configurable and editable automatic crossfading of overlapping items
* Per-item pitch shift and time stretch
* Arbitrary item grouping
* Markers and envelopes can be moved in logical sync with editing operations
* Ripple editing - moving/deletion of items can optionally affect later items
* Multiple tempos and time signatures per project
* Ability to define and edit project via regions
* Automation envelopes Changes in REAPER v2.55 - January 20, 2009: * Fixed hang on MIDI bank/program file change
* Fixed metronome stutter on first downbeat
* Fixed VST compatability with plug-ins that send MIDI events from UI/etc
* Fixed reasamplomatic ui updating bug
* Fixed render dialog peaks display
* ReaVerb: lower CPU use, "set all" button for overriding all instances FFT settings
* ReaVerb: fixed issues with complex chains that convert channel counts
* ReaPitch/ReaVoice: lower CPU on silence
* Code to prevent elastique from chewing CPU on near silence
* FX parameter MIDI learn: fixed updating of "set with selected tracks" flag
* FX preset loading, VST program changes now add undo points
* Meta-actions to conditionally process actions based on the sign of CC parameter value
* Stretching using Elastique by more than a factor of 10 now will result in correct timing but not-fully-preserved pitch
* mp3 encoder now handles writing mono better (when passed stereo data)
* Existing item selection is cleared when recording stops (recorded items are selected)
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