this is a tutorial for ReBirth in three steps...
http://www.futureproducers.com/tutorial.php/id/11
http://www.futureproducers.com/tutorial.php/id/12
http://www.futureproducers.com/tutorial.php/id/13
i hope this proves useful for the time being.
other than this, you might try using google and you'll find some
more hints on ReBirth for sure.