Sonic Walker

In 1997 Propellerhead Software introduced the ReBirth RB-338, a revolutionary computer software simulation of classic Roland devices - the TB-303 Bass Line Syntheziser and the TR-808 and TR-909 Rhtyhm Composer.
As of today, ReBirth has come to an end but will be given away for free. Anyone can download and use ReBirth 2.0.1. ReBirth owners can upgrade to Reason for an attractive price and a special ReBirth RB-338 ReFill is available for all Reason users, free of charge.

http://www.rebirthmuseum.com