ReWire Audio and Synchronization
Think of Rewire as the software equivalent of an audio multi cable. ReWire allows you to route 64 channels of audio from Reason into your favorite MIDI Sequencer or audio recording program, for recording or further processing. What's more, ReWire takes care of all synchronization chores, automatically and transparently. Just fire up the two ReWire compatible applications and they will play together in perfect, sample accurate sync. And there's of course no compromise in sound quality. Rewire's audio resolution is extremely high, (32 bit floating point) and it will handle practically any sample rate.
The new version of ReWire, ReWire2, also incorporates real time MIDI streams. With two ReWire2 applications connected, you can send and receive MIDI data from one program to the other. Just select a track in your MIDI sequencer, set it to play one of the devices in Reason's rack, and record your performance. Or, tweak a knob on Reason's front panel and record the automation in the other program!
Nothing to install, no settings to make, no MIDI Channels or buses to get your head around, just hit Record and go.