display multiple .wav files on same graph

Hi, I am using the sound& vibration toolkit for my project. I am stuck perhaps on something very small!!!!
I am trying to open and display multiple .wav files but i haven't been
successful with this. There is already an example which shows how to
display one .wav file on a graph. My final goal is to run several .wav
files and  do fft of each and display all resultant on same graph.
Can someone help me out here. All i want is to open and read several
..wav files.

I have attached the code that reads one .wav file.  I am using labview 7.0 so please help


SVXMPL_WAV Power Spectrum.vi:
http://forums.ni.com/attachments/ni/170/177488/1/SVXMPL_WAV Power Spectrum.vi
.

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