Hi! Well, I have tried to put the 50/60 hz mod in my MD 2, and I have followed the instructions that can be found on the misc. section of this site, so I cut the trace, and then I found JP3 & JP4 ... and here is where I donÂ´t understand well the instructions, so I looked those 2 jumpers, and I found something like this : o----o JP3 o----o JP4 / o -------> Is this a resistor?? Well, so I thought "If the Jumper that is solded to that resistor is the one who make the console run at 50 or 60 hz, then I have to solder the middle pin of a switch to the resistor, and left pin with JP3, and right pin with JP4" ... but I doesnÂ´t work .......so what I have now is a MD 2 running at 60 hz ... any idea of what am I doing wrong???