Assuming this is SkyView, you should be able to go to SETUP MENU > SYSTEM SETUP > AUDIO SETUP > ANGLE OF ATTACK, and then click right one more time to enter the selection menu where you can choose when the alarm comes on. There isn't a separate button when you highlight the AOA option - you need to click right one more time, and then select your new option from the menu on the right. Then you can click ACCEPT or click left to save that setting.