As mentioned above, the Atlas (and P2K and BLI) controllers are for QSI®. Per the BLI/PCM website http://precisioncraftmodels.com/BlueLine-c3479.html
You need the "DC Sound Effects operated with DCMaster Analog Control Module." AKA the PCM DC control module.
These two are very different controllers.
On the above webpage, scroll down to the 3rd FAQ for more information.
Quantum is for QSI Equipted engines. Decoders that are made and programmed by QSI will work and respond to Quantum Controller.
Blueline is BLI's effort to divorce themselves from QSI and Royalties and provide more engines at lower prices for the Analog DC Crowd.