Mh, should be pretty straightforward. At least it is on my device. I’m using an ipega 9025, connected via bluetooth without any additional stuff.
In Voodoo Control settings, I can assign each control optioms to every joystick on my gamepad (1 dpad and 2 analog sticks).
I can even map “2axis” to both my left and right analog stick at the same time. Which doesn’t make any sense, because they interfere with each other. But still, it’s perfectly possible.
What joypad are you using? And what ecactly do you want to map?