Please help with unloading a streaming sound

Hello,

I am hoping someone can help.
I am making an mp3 player, with streaming sound files…

the one problem, I have been looking everywhere on how to unload, or let go of the sound file on completion, or when the stop button is pushed.

I have tried:

streamingSound.onSoundComplete.unLoadSound(); // Unload the sound file

and even a delete statement…

thank you in advance…