Propellerhead Software is the creator of Reason that works for Windows Operating system (winxp SP3, winvista 64 bit or win7 64 bit). Reason requires 3 GB Hard disk drive space, Intel Pentium 4 processor, 2 GB RAM, 16 bit windows compatible sound card, Internet connection for registration, and 1024 X 768 resolution monitor. This musical software is packed with a bank of audio files and can receive more sound files thru refilling it. There are available refills produced by Reason such as disco school, strings, drum kits, piano kits and many more. Its user interface looks like a real music recording rack. All controls are visible that looks like buttons, knobs, faders and LEDs. Rerouting the wires can be done manually once users flip over the users interface. Thru this, users can customize the instruments and effects connected to the music rack. Addition rack is now available by getting the Reason Essentials 1.5 that works with Reason 6.5.