jumperboy said:
It seems the Maudio version is only one direction only?
Yes, it is one direction only.
That is not just the M-Audio though, the others are also one direction only.
If you want 2-way communication you'd need 2 kits, one for each direction.
jumperboy said:
My thought is that you would have to have a bi-directional communication between the floor controller and the Axe. Am I right?
No, you don't
need 2-way communication. You may or may not want it.
Depending on your floor controller and use it may be convenient or completely useless to have t-way communication but it's not neccesary.
With a Gordius, Liquid Foot or maybe one day an MFC101 you'd want 2-way but with all others it would be pointless as they don't do anything with the information the Axe-Fx sends back anyway (and the Axe-Fx doesn't send anything they can use).
S.R.