REAPER is able to map control surfaces (even game controllers) to faders, plug-in controls, REAPER actions and more, helping you to create a working environment that works just the way you expect. You can import any audio or MIDI source, maybe plug in a microphone to record something, then loop, pitch shift, trim, time stretch, fade and otherwise edit your work until you're happy. If you're unfamiliar with the jargon, essentially this means that the program is a high-end and very configurable digital recording studio. REAPER is a professional Digital Audio Workstation (DAW).
