Since I wasn't able to test audio or firewire yet (no OS installed), I only connected power & USB. Here is what my front panel connector looked like:

With only the PWR+, PWR-, LED+ & LED-, the power button & LED worked:
5 PWR+ (pin6 on F_PANEL of Gigabyte EP45-UD3P motherboard)
6 LED+ (pin2 on F_PANEL, labeled as MSG+)
14 LED- (pin4 on F_PANEL, labeled as MSG-)
18 PWR- (pin8 on F_PANEL)
Adding USB using a 4pin header connection:
7 USB+ (pin5 on F_USB of Gigabyte EP45-UD3P motherboard)
8 USB- (pin3 on F_USB)
9 +5V (pin1 on F_USB)
10 GND (pin7 on F_USB)
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I used a laptop 40 to 44 pin IDE converter (search ebay for a cheap 99cent one). What was important was the 2mm pitch end had individual separate cables (as opposed to the flat ribbon 40 pin 2.54mm pitch side). A needle inserted lifts up the tab allowing the cable & tail to slide right out. I trimmed the cable to 3-4 inches, soldered it onto solid wire cabling to the motherboard & trimmed the original 44pin connector to 2x9. The tails went back into the connector & that's the end of the 99cent mod.