docs: def to_before_pedalboard(self):
          """
          Change the current :class:`.Pedalboard` for the previous pedalboard.
  
          If the current pedalboard is the first in the current :class:`Bank`,
          the current pedalboard is will be the **last of the current Bank**.
  
          .. warning::
  
              If the current :attr:`.pedalboard` is ``None``, a :class:`.CurrentPedalboardError` is raised.
          """
          if self.pedalboard is None:
              raise CurrentPedalboardError('The current pedalboard is None')
  
          before_index = self.pedalboard.index - 1
          if before_index == -1:
              before_index = len(self.bank.pedalboards) - 1
  
          self.set_pedalboard(self.bank.pedalboards[before_index])