playstation controller to PC help ( pop’n music)

IM currently trying to get my pop’n music controller to function correctly on my computer I have an old as fuck ps2 to usb converter that works half ass i can use the controller on lvl 1 – 25’s with it getting like 10 -20 misses tops but on songs above that I can’t keep a combo at all , I’ve heard ps2 to parallel port is the best route but i am un able to find a place to purchase that on the interwebs , so if anyone knows of a spot where I can buy one or knows a 100% working ps2 to usb that wont fuck up and will allow me to pop my music correctly then that would be great! Thanks guys!