Reaper позволяет записывать, редактировать и воспроизводить аудиофайлы.
Поддерживается воспроизведение и запись с ASIO, Kernel Streaming, WaveOut и DirectSound, чтение форматов WAV, OGG, MP3 и MIDI, запись WAV и MIDI. Имеется возможность индивидуальной обработки каждого трека по отдельности. Поддерживаются плагины; интерфейс можно поменять сменой скина.

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REAPER is a powerful but sensible Windows application that lets you record, arrange, edit, and render multi-track waveform audio. It provides an extensive set of features, but is a very small and lightweight application (the installer is less than 1 megabyte, and includes many effects and a sample project).
REAPER supports ASIO, Kernel Streaming, WaveOut, and DirectSound for playback and recording. It reads WAV, OGG, and MP3 files, and records WAV files. You can arrange any number of items in any number of tracks and use audio processing plug-ins (DirectX and Jesusonic). REAPER also supports volume, pan controls and envelopes per track, multi-layer undo/redo, and user creatable color themes.
Changes Reaper v1.836:
* track midi input indicators dont show "active sensing" events
* midi inputs can now be assigned as "control only"
* reaninjam: now supports 8 inputs, all mixed down when not connected
* copy selected area of selected items trims underlying midi data
* actions for selected items on/offline, rebuild peaks for sel items
* added vertical scroll in long FX chain lists
* fix for tab to transient on empty items potentially crashing
* fixed zoom in peaks drawing on looped items
* action to manually check for new versions (help menu)
* reacomp: new alternate attack curve mode, "classic attack" mode for old projects/those who prefer it
* JS: better rng for dithering fx
* vst: updated problematic track plug-in sustain resetting
* vst: program combo box updates on fxp/fxb load
* vst: program names are now editable in combo box and will update the vst if supported