So I was playing the Black Garden mission and noticed this strange noise that would sound when I entered a specific spot in the level. Near the end of the garden there is a small area right before u enter the "dead end" (as your ghost calls it. The big room where u open the door to the heart.) In that small area u fight a small group of vex before heading into the big area. The area has a circular pad in the center and three red lights next to it. Sometimes as u enter or leave the small area u can hear this beep noise like something has activated or been stepped on. It's quite strange and sounds unlike all the other weird vex background noises. It only sounds as u enter or leave the small room. This maybe a glitch in my game but I'd like to see what u think. Go to the spot I described and turn up the volume and listen for a strange beep.