Why are sounds for IVR such a puzzle?

There must be some way to understand the built-in sound file module but, it seems to be beyond the realm of mortals. The module seems clear but nothing but GSM appears and it is not obvious even what must be done to succeed. Sometimes there ARE better things than free. How about less difficult?
HELP!

It would be easier to assist you if you asked a specific question. What sort of problem are you having?