How do I configure a USB dance pad for DDR Mario Mix

[eltelelel]

I have a USB dance pad which I use for other games like stepmania on PC. I am trying to configure the controller settings to work properly with Dance Dance Revolution, Mario Mix so that the buttons are all mapped to the proper locations on my dance pad. I am having issues. I already selected port 1 as the dance mat. I figured out that the X,B,Y and Z buttons on the controller configuration screen are mapped to the arrows, But I cannot find which buttons are mapped to Start, A, B and Z. The only buttons I was able to map were the in-game arrows themselves, which like i said are detected as gamecube buttons X,B,Y and Z. I have tried to find a solution to this, but am having no luck.