Smart audio multi stream

hello
I have a t400 thinkpad. I choose the multi stream option in the smart audio softwere but still only the external (connected via the headphone jack) work. the internal speakers of the laptop do not produce any noise. As I understood the multi stream option suppose to enable both internal and external speakers.
Can anyone help? I really want to use both at the same time... 
PS: when I press the red and blue play demo buttons on the smart audio (multi stream) page I can hear the demos on both internal and external speakers , but in winamp and all other sounds I can only hear in the external speakers.
Thank you

Hello.
So how do I take advantage of this feature? I want to play music through the mini-jack port and play youtube video through the internal speakers. Before somebody asks why, it's so that two people can use the computer at once. One can watch youtube and the other can listen to music. If it's possible, please step-by-step instructions. I have played around with the SmartAudio software and read the shoddy help file, and not had a clue as to why they would show this feature only to play two pre-recorded sound files. 
Thanks in advance

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