Does anybody have the pin-outs for the aux in on the JVC headunits (like the JVC KD-SX750)? It has cd changer controls. <a href="http://www.crutchfield.com/cgi-bin/S-qJebR3lDLXU/ProdView.asp?s=0&c=2&g=50900&I=105KSU57&o=&a="> This </a> is the cable from crutchfield, but instead of paying 40 bucks for it I'd rather make one myself..