hoping someone has figured a way to change the inf file to use a headrush prime as interface , as headrush prime has drop pedal that works great and would like to use it with this game so i dont have to keep retuning guitar when chnging to differnt tunings .. any help would be great ,,thanks in advance..

i use Digitech Drop Pedal,,, Works great

You don't need to use the headrush as an interface. Just connect the RS cable to the analogue out of the headrush.