Symptom: The MAX on-screen boom controls are not enabled.
Cause: There is an external switch box connected to the MAX terminal and/or "External Switch Box" is selected under "Section Control" settings.
Resolution: The external switch box becomes the boom control, overriding (disabling) the on-screen boom controls. Use the external switch box for boom control. If you do not have an external switch box, ensure the "External Switch Box" check box is not selected in the "Section Control" settings of your terminal.