[Jeff]

You need to check that the slider object passed to the callback function is sliderSWRD before changing that parameter:

def onSlider(obj,pos):
    if obj == sliderSWRD:
        #change parameter

viz.callback(viz.SLIDER_EVENT,onSlider)

You can also use the vizact.onslider command to call different callback functions based on which slider was changed:

def onSliderSWRD(pos):
	#do something
	
vizact.onslider(sliderSWRD,onSliderSWRD)

def onSliderSWEX(pos):
	#do something
	
vizact.onslider(sliderSWEX,onSliderSWEX)