     # If the speed value is `true` reset the speed to the original settings.
     # Set it to zero if `false`.
     if typeof speed is 'boolean'
-      speed = if speed then @settings.speed + 'ms' else '0'
+      speed = if speed then @settings.speed + 'ms' else '0ms'
 
     # To loop through the shaders, derive the correct pair from the current anchor.
     if @lastAnchor is 'left' or @lastAnchor is 'right'

    else
      @["_#{ @_touchAxis }1"] = e.targetTouches[0]["page#{ @_touchAxis.toUpperCase() }"]

    # Return that value to an external listener.
    @settings.touchStartCallback @["_#{ @_touchAxis }1"]


    return unless @_touchEnabled
    e.preventDefault()
    # Set a reference to the current x or y position.
    if e.type is 'mousemove'
      current = e["page#{ @_touchAxis.toUpperCase() }"]
    else
      current = e.targetTouches[0]["page#{ @_touchAxis.toUpperCase() }"]
