Owner`s manual

Console – Mac OS X, all products
Settings dialog
The settings dialog for the OS X console lets you set the S/PDIF output
format and the digital input auto-mute.
The S/PDIF format lets you select the format of the outgoing S/PDIF status
bits. Different S/PDIF receivers need to see the S/PDIF status bits formatted
in either consumer or professional format; if you are having trouble
connecting the S/PDIF output on your Echo hardware, try changing this
setting.
The digital input auto-mute automatically silences the S/PDIF and ADAT
inputs when they are not synchronized to an external clock. This avoids
problems where extremely loud digital noise is heard when signals at
differing sample rates are sent to the digital-in or when a digital cable is
unplugged. If you are having trouble receiving signal on your digital inputs,
uncheck this box.
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Console – Mac OS X, all products