I can’t get the headphone outputs working on my MboxPro (3rd gen.).
The headphone outputs from the MboxPro are set to independent mix outputs by default.
Open the Driver Control Panel for the MboxPro. (Setup>Hardware Setup, click launch control panel)
Set the output from Headphones A and Headphones B to match Outputs 1/2. By default that would be Stereo Mix 1.
(see “Using the Driver Control Panel” chapter of the MboxPro User Guide)
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