NugComboBar 

function NugComboBar.UNIT_COMBO_POINTS(self, event, unit, ptype)
    if unit ~= allowedUnit then return end
    local comboPoints = GetComboPoints(unit);
    
    for i = 1,MAX_POINTS do
        if i <= comboPoints and not self.p[i].active then
            self.p[i]:Activate()
        end
        if i > comboPoints and self.p[i].active then
            self.p[i]:Deactivate()
        end
    end
    
    if comboPoints == 0 and not showEmpty then
        self:SetAlpha(0)
    else
        self:SetAlpha(1)
    end

    if comboPoints == MAX_POINTS then PlaySound(...) end

end