wait I dont kno if this has been found out(doubt it tho) b4 but I just figured out recently and by the looks of it I wont get my hands on a digi cam soon so il just post it.
btw it can be done anywhere on the screen.
the 1st one I found was:
jump HK c.mp hcb.hp activate f,b,f hp rite after the last hit roll then dp lp f,b,f Hp
roll dp lp any special.
the 2nd one is(this one requires more timing) jump HK c.mp hcb HP activate f,b,f wait abit after the last hit , f,b,f lp… special.
so they go
j.HK c.mp hcbHP AA f,b,f HP, roll ,dp lp f,b,f roll , dp lp special.
J.HK c.mp hcb HP AA f,b,f lp (repeat) special.
to be safe for both combos after Hcb HP
jump activate lk then f,b,f…