I moved to Ecuador and just purchased a new X-Terra 705. I have my other detectors in the States and won't be bringing them here until sometime next year. I have read the manual, watched videos, etc, but still can't get the "AU" to show up on the screen to set Noise Cancel. I am wondering if there is a problem with the machine, or more likely what I am doing wrong? From the start I turn machine on, set Pattern 1, Press Menu button to Noise Cancel, Press Coin/Prospect button, but "AU" never appears. Any button I push after that gives me the deep tone telling me that is not an accepted input. I have tried so many other combinations as well to no avail. If anyone can tell me the procedure that works on their machine, I will try that. Much thanks, Sam