potentiometer for right ,left operation

hi,

i have gdc3660e and i trying to add 1 pots to manually run vehicule ( 2 motors ) , like right,left and both motors at center of pot. i made it with arduino with no problem but i don t want to add arduino if i can make in script or directly in controller software. my agv have 2 motors rear and caster in front. i currently learn and make try with microbasic in roborun.

thanks in advance !