Sony PlayStation 2 (PS2) Console "ddr pad working" Questions

...pad does not work with a ddr game on ps2 slim, is there a way to make the dance pad work with this game? The dance pad is just a big flat controller. If it doesn't work, there is probably an issue ...

ddr game pads not working when plugged in when i plug in my 2 ddr pads only 1 works, then after a while that one doesnt work and the other one works, but only ever 1 at a time. i've used them both at ...