If the audio jack is hardwired to cut off the internal speakers there's not much you can do without soldering. You can try to set up quadrophonic speakers in your sound equalizer and assign the notebook's speakers to front r/l then try if you can assign the external speakers to back l/r.
Another idea would be to get a headset with an internal usb soundcard. I had the Speelink Medusa which was pretty neat, as it had several little speakers in each pad. It costs new about 50 bucks however.
Today, when I need surround sound, I only use a good stereo headset, as the virtual surround has become pretty good from the software side - though of course not comparible with a set up of good 5.1 or 7.1 external speakers.
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