code: def add_modifier(self, m_type=XenaModifierType.standard, **kwargs):
          
  
          if m_type == XenaModifierType.standard:
              modifier = XenaModifier(self, index='{}/{}'.format(self.index, len(self.modifiers)))
          else:
              modifier = XenaXModifier(self, index='{}/{}'.format(self.index, len(self.xmodifiers)))
          modifier._create()
          modifier.get()
          modifier.set(**kwargs)
          return modifier
docs: Add modifier.
  
          :param m_type: modifier type - standard or extended.
          :type: xenamanager.xena_stram.ModifierType
          :return: newly created modifier.
          :rtype: xenamanager.xena_stream.XenaModifier