After making several adjustments to audio & video on my storyboard, I have noticed 2 new things showing up that I don't understand. 1) An audio clip has a new color (pink instead of usual purple) and 2) there are small red rectangles on certain video and audio clips with a time reference (Ex: 0:00 or -0:12 or +0.04) Can someone help me understand what these new items are telling me about the audio & video clips? They showed up after doing some ungrouping/cutting/pasting/regrouping in an effort to alter a few seconds sound that was part of the larger audio clip. (I removed a word out of a spoken sentence and replaced it with background audio). I have included a screen capture. Thank you!