actually forgot, with halo you need no separate program.
Anyways
PLUG IN YOUR ROCKBAND DRUMSET TO A USB PORT.
Make sure the Foot Pedal is plugged into the drumset
START HALO
Go to controls, gamepads, select the name for the drumset
GO TO CONTROLS, KEYMAPPING
Or however it is for halo, click on the top to switch from keyboard to your drumset,
SET DRIVE TO THE PEDAL
click the control, press the pedal, let go of the pedal. done.