Multiplayer Voice Commands

The F1 through F4 key's not sure exactly what is what any more

It is not F1-F4, I've tried pressing them each match and it does nothing for me. At first I thought you had to be leader to do it, but then in one match I noticed multiple people were using the commands.

I've also included the corresponding Dpad commands for those using them

F1 - Up - "Attack this target."
F2 - Left - "Retreat!" (you'll hear this a lot on Perilous) 
F3 - Right - "Thanks"/Random banter.
F4 - Down - "Attention/here!" (usually when the group runs past a side door)

You need to have a target for F1 but the rest should be testable at any time. 

If they're not working for you, I wonder, have you rebound the single player F1-F4 party select commands? 

There is a way to rebind them? Because i don't use WASD, but the directional keys... so i would bind them elsewhere..