code: def multiplied(*values):
      
      values = [_normalize(v) for v in values]
      def _product(it):
          p = 1
          for n in it:
              p *= n
          return p
      for v in zip(*values):
          yield _product(v)
docs: Returns the product of all supplied values. One or more *values* can be
      specified. For example, to light a :class:`~gpiozero.PWMLED` as the product
      (i.e. multiplication) of several potentiometers connected to an
      :class:`~gpiozero.MCP3008`
      ADC::
  
          from gpiozero import MCP3008, PWMLED
          from gpiozero.tools import multiplied
          from signal import pause
  
          pot1 = MCP3008(channel=0)
          pot2 = MCP3008(channel=1)
          pot3 = MCP3008(channel=2)
          led = PWMLED(4)
  
          led.source = multiplied(pot1, pot2, pot3)
  
          pause()