tape = peripheral.wrap("bottom")

repeat
  if tape.read() == 0
    then tape.stop()
         tape.seek(-math.huge)
  end

  if redstone.getInput("left") >= 1
    then if tape.getState() == "STOPPED"
           then tape.play()
           elseif tape.getState() == "PLAYING"
             then tape.stop()
                  tape.seek(-math.huge)
         end
  end
until i == 0