Ah....Did a little digging on the Swift web site..They are using in addition to the AC and DC Magnateks, an animal known as the "Swift Drive"... Throughout the documentation they refer to this as the Quantum Quiet drive...

Link below, free of charge from Swift CEC..

http://www.swiftcec.com/resources/documents/manuals/swiftdrive/SWIFTDrive_manual.pdf

It Don't mean a thing if it aint got that swing.

Cool, Free, Johnny Smith courtesy of NPR..HERE
http://www.npr.org/ramfiles/asc/asc25.smith.asx