Hi again,
Apologies for the delay in getting back to you. You should be able to find an example code to play sounds in LabVIEW itself. LabVIEW 4.1 for Windows ships with an example, Play Sound, located in the playsnd.llb library in the LabVIEW\Examples\DLL\Sound folder. This VI calls a DLL that uses Windows API function calls to play .WAV files.
Unfortunately I've not been able to set up a replica system here yet, but I shall keep trying. Please let me know if you've made any progress regarding this or if you have solved the issue.
Many thanks,
National Instruments | Northern California