labview ,sound card

[dfaweew]

hello ,,everyonei have used this vi inhttp://forums.ni.com/t5/LabVIEW/Split-audio-into-left-and-right-channel/td-p/1635312 to Derived signals to the digital oscilloscope,but Image is displayed as:If this is right (I think it's really right), should show a sine, cosine,but it's not ;so please tell me why ;and how to deal with it;thanks!!