I have all the needed parts listed in the wiki, but I'm lost at "inverting the signal"? I can follow directions and solder easily enough, but have little electrical knowledge. Can someone please help?
Pulling a pin low or high means applying 0V or +5v to it (you have to check the datasheets of the chip for exact values, though most chips work with +5v.). One of the ICs turns emphasis on if it's pulled low (0v on the emph pin), the other turns emphasis on if it's pulled high (+5v on the emph pin). You need to invert the signal, so whenever chip A sends 0v, chip B receives +5v. You can use a hex inverter IC for this.
Or, you can measure the voltage of the emph pin with a multimeter and apply the inverted signal directly, since I doubt that the console actually changes emphasis during function. Meaning if the PCM1725 pin 12 measures 0v, you can just solder +5v to pin 3 of the cs8406.