I am using a standard 15 pin VGA cable as an extension cable for a sound system control circuit. As I have read not all of these are straight through on all 15 wires. I have checked several and so far they all have been straight through and have no tied together wires. It is time consuming and a pain to test each and every one of the 15 fully. I know by not fully testing each one it's on me if I damage something, but does anyone know which are the wires that may be tied together so I can just test those specific ones? Thank you to anyone who knows.