Hi,
You use the COM Object viewer to get the function of the particular OCX. You can go to COM Object viewer
Tools -> PRO*Tools
There you can see the com object viewer. From that you can open a OCX file and PROGRESS syntax for any function or property.
Place the OCX on the window and use the code to play the MP3 files.
If you need a sample please let me know.
Cheers,
SamanthaSL.