Use the Online pop-up menu in the Transport Master selector to take a MIDI (or Machine) device offline.2 In the Transport, click on the Online pop-up menu and deselect the device (Machine or MIDI). Device choices depend on the current Transport Master and which devices have been set up in Pro Tools.
To bring a device back online, click and reselect it in the Online pop-up menu.
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The Online pop-up menu will only display devices that have been properly set up in Pro Tools.
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To set up machine devices, see the MachineControl Guide.