Updates the signal plots kwarg *'plot'*, which is
        either 'response' or (well actually anything).

        For other arguments, see: :meth:`FFTWidget.updateData<sparkle.gui.plotting.pyqtgraph_widgets.FFTWidget.updateData>`

def updateSignal(self, *args, **kwargs):
        """Updates the signal plots kwarg *'plot'*, which is
        either 'response' or (well actually anything).

        For other arguments, see: :meth:`FFTWidget.updateData<sparkle.gui.plotting.pyqtgraph_widgets.FFTWidget.updateData>`
        """
        p = kwargs.pop('plot')
        if p == 'response':
            self.responseSignalPlot.updateData(*args, **kwargs)
        else:
            self.stimSignalPlot.updateData(*args, **kwargs)