Vivaldi uses Dual AES to transmit DSD data between units instead of 1394. We released a set of software updates for the Scarlatti and Paganini ranges in 2013 to add the same Dual AES DSD interface. This allows Scarlatti and Paganini owners to upgrade only part of their system to Vivaldi and get most of the benefits of the new technology. As an added bonus, the Dual AES DSD interface sounds better than the 1394 interface. Please press the Menu button three times to check the Control software issue and then compare with software history to see if your system is loaded with compatible software.