Trying to program my RDS8000 to get throttle-cut. It seems no matter what I do I cannot get to the screen that says T-CUT. Following the program instructions on pg. 36 of the manual says "To get to the th channel, then press down several times on the function key until you get to T-CUT". 1st press gives me REV-2nd gives me CNT and 3rd gives me EPA. Nothing after that. Am I doing something wrong?