Well the "speaker cable", unplug it and use "standard audio cable" to interconnect the audio out to the audio in on your mobo.
*www.designnotes.com/Merchant2/graphics/00000001/CA006.JPG
*fastblogit.com/media/speak_seth_1150738129.jpg
Pardon the hurried illustrations, but you get the point dont you>?.
--------------------
ALTERNATIVELY
If you want absolutely the best, get ADOBE PREMIERE. It has got everything youll ever need. But unfortunately you will have to pay
....or um... "use" the internet
Cheers.