Cut and paste from the:
Originally Posted by HD621 datasheet
Audio FIFO buffering and resolution enhancement improves PCM audio received via HDMI.
You can't buffer outputs at the output stage (from a data point of view, not electrical).

The MC200 and Explorer are:
A: Output devices
B: Input to both is USB (the MC200 is a USB audio board and minature computer) - USB will have its own way of dealing with data.