From Matt's blog at http://line6.com/blog
Line 6's Propellerhead Product Specialist Matt Piper demonstrates how to use sidechain routing along with the Gate feature on a channel of Record's mixer to add a sub-bass sine wave to each kick of the bass drum in an acoustic drum track.
The software used in this video was Record Reason Duo by Propellerhead. That product has since been replaced by Reason 6.5. Reason 6.5 has everything you see in the video plus powerful new features including new effects devices, thousands of new presets, sounds, and loops, and support for 3rd-party Rack Extensions.
Here is a link to the entire playlist of Propellerhead videos by Matt Piper at line6movies: http://www.youtube.com/playlist?list=PL805B781589CF801D