Adding an action for Tellus 4 Users of the Tellus 4 can add actions to a cell on a communication grid, in order to configure certain items (volume, audio, ...) in the Tellus 4. Edit the cell (F5). Click Add item Ctrl+click=Copy item in the Actions options group. Choose Tellus 4 from the Actions drop-down list. Note: If Tellus 4 cannot be found in the list of actions, check that the add-on has been enabled. See Activating/deactivating an add-on. From the drop-down list, select one of the following actions: Headphones: on Headphones: off Phone: on Phone: off Speaker: on Headphones: on/off Audio to speakers/headphone Speaker: on Speaker: off Click OK.