Let’s be clear on the difference between the DVI standard and a multi-pin data switcher that happens to use DVI connectors. The DVI standard does not support audio, however, if a piece of equipment has the ability to switch between data input via multi-pin cables and connectors, pin-for-pin for all pins available, then it can pass any kind of data through those pins – ANY kind of data that requires no more than the number of pins available and does not exceed the capability of the electronics. The 990 does not decode incoming data, whether DVI data or HDMI data arriving via a DVI connnector, nor encode data for output, it merely passes through the data being input, therefore the standard or format or content of the data does not matter. As such, if there are enough pins to carry HDMI data, including audio data, through the DVI connectors, then that data passes through as easily as any other data. Simple.