Taipo,
If you import the .wav file into LabVIEW and convert it to the waveform data type, you could use the SVT to do third-octave analysis on the waveform and then use the SVT Weighting Filter VI to adjust the level of different octaves in the signal.
If you are looking for a pre-made equalizer example for a .wav file in LabVIEW, we do not have an example that does that at this time. However, there are many programs available on the internet that can equalize a .wav file.
Sincerely,
Ross C
Applications Engineer
National Instruments