Reason 4.0 (the forth edition) is an audio composing and editing application from Propellerhead Reason. Released in the end of 2007, Reason 4.0 has plent of new upgrades to keep you satisfied and happy. With a new multi-synthesis synthesizer Thor, users can work with six oscillator types, four different filters, a step sequencer, and a modulation matrix. Besides the new synthesizer, Reason 4.0 brings a whole new work environment and work flow to the program. It includes a new sequencer style with multiple track lanes, vector automation, and dedicated device tracks.