Reason is a complete music system. It features samplers, analog synths, mixers, step-time drum machines, effects, and a real-time multitrack sequencer for fast and intuitive music making. All of Reason's devices have the look and feel of the real thing, and you can use each device as many times as your CPU can handle it. Reason hooks up to your MIDI keyboard, giving you MIDI control of all devices, knobs, faders, and parameters. Whether you're a big-time producer or a bedroom DJ, this application provides all the necessary tools for creating, editing, and mixing the music of your choice, all from the comfort of your own computer.

New in version 2.5 are RV7000 Advanced Reverb, BV512 Digital Vocoder, Scream 4 Sound Destruction Unit, UN-16 Unison effect, and the Spider Audio Merger & Splitter.