def UpdateSlider( self, value ):
        '''Move slider position when tk.Scale's trough is clicked or when slider is clicked.'''
        print( '\ndef UpdateSlider():' );       print(type(value),'value = ',value,' sec')
        if self.player.music.get_busy():
            print("Track Playing")
            self.after_cancel( self.loopID ) #Cancel PlayTrack loop    
            self.slider_value.set( value )   #Move slider to new position
            self.Play( )                     #Play track from new postion
        else:
            print("Track Not Playing")
            self.slider_value.set( value )   #Move slider to new position