need help with combo

I need help on how to execute this combo on an arcade stick.

Im playing kof xi and using ash. how do i cancel his charge down, up+B/D, into his super qcf, qcf, B/D.

What is the motion that im supposed to be doing?

I can get it on a pad, but can’t figure out how to get it on my stick. I got a seimitsu ls-32 padhacked to a ps1 controller if anybody can give me some tips.

qcf uf u B qcf B

practice it on emulator, load up kof2000 and take robert to training mode