Propellerhead Reason 4.0 Upgrade Thor Polysonic Synthesizer: Thor is a semi modular synth with interchangeable oscillators and filters. With its six oscillator types, four filter types and endless modulation possibilities, this synth comes with a sound like nothing else on the planet. RPG-8 Monophonic Arpeggiator: A powerful arpeggiator with multiple play modes, pattern function and much more. ReGroove Mixer: ReGroove mixing is a way to work creatively with grooves, timing and feel in real time. Hands-on access to 32 channels of groove parameters will make this an essential tool for any musician who is serious about their beats programming. The New Reason Sequencer: With a whole new look, a ton of fresh features and a completely new way of handling sequencer data, the Reason sequencer still offers the streamlined workflow Reason is famous for, but with a new level of sophistication.