The Buff Warning tab controls how alerts are sent on buffs.
The dropdowns have the same options for all settings, alerts can be when within spell range, within 100 yards (visible range) or always.

• Always enable bar - When not settings the health bar to the buff colour, always set it to enabled if not already in this state.
• Change health bar colour - Change the bar colour to the setting defined.
  • Only when missing - Only apply if the buff is missing.
• Display warning on buff - Display a text warning.
  • Only when missing - Only apply if the buff is missing.
• Play sound on buff - Play the sound set on the slider below the option.
  • Only when missing - Only apply if the buff is missing.
• Sound channel - Select the sound channel to play the buff sound.