ADAT I/O and/or Machine Control functions do not work with Pro Tools.
This can be caused by having “Use Apple SerialDMA driver when available” on within OMS (2.1 or later). Open the OMS Setup application and current Studio Setup Document. Select Preferences from the Edit menu and uncheck “Use Apple SerialDMA driver when available.” This option must be disabled (unchecked) when using Pro Tools 3.x or 4.x.
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