its simple,
But u need to sacrafice a cellphone ear bud cord.
get the cord and strip it. you will se a bunch of wires. If you know or anyone you know, knows about audio wiring, its a slice of cake from there.
One connection is going to be a signal connection and the other will be return. There may be 2 more for the MIC or just one more.
If you got that far, simply connect it to a 1/4 inch headphone jack, and record it into your PC/MAC
I had a couple beers so if anyone wants to elaborate on this, be my guest.
OR
you can simply just play it back into a mic, clean it up in a wave editing program and bingo.
good luck