jack freewheeling mode

Hi,

Can someone tell us more about the jack freewheeling mode as described here by Ken Restivo?
http://www.restivo.org/blog/archives/in-praise-of-jack

Where can I find more info about it and how do I use it?

The free-wheeling mode is always enabled, and is noticeable when you do an export of a session to disk. It will run though the session faster than real time, while still rendering all the automation, effects and mastering (via jamin) to the session as if played in real time.

As Ken said, a real time saver, especially if you have to create a few different versions of the same session for proofing purposes.

Ok, thanks!