"Unable to establish communication with the USD. Be sure that your USD...

"Unable to establish communication with the USD. Be sure that your USD is turned on and connected." when trying to set up a Universal Slave Driver in Pro Tools 4.3.1.

On non-G3 computers, check to see that they have the 'Serial (Built-In)' extension in their active extension set. This will happen in PT 4.3.1 if this extension is missing.

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