choosing between interfaces

[Zinc69]

i was wondering if ther was a setting that could choose what NIC adapter to use

i have 2 NICs, 2 differnt connections to the internet
and to speed up and upload i would like to spilt it up and send 1/2 though the one connection and the other 1/2 through the other connection

i have tried bridgeing too and that dont work

just wondering if FFXP supposrts that or is there another program that does that

thx