code: def signal_scale(self, value):
      self._y_transform["scale"].value = value
      self.update()
  
imports: import numpy
  import math
  from vispy import gloo, app, scene
  from vispy.visuals import Visual
  from vispy.visuals.shaders import Function, Variable
  from vispy.visuals.transforms import TransformSystem, BaseTransform
  from vispy.util.profiler import Profiler
label_desc: Use image node_id 5 for calling the SignalsVisual obj's underlying member method code with example usage: obj.signal_scale(value) without return types