We have had this issue come up 4-5 times over the past year. We will begin working on a project and then after opening and closing it a few times through the week, we start to hear a loud buzzing sound that is only in the right channel whenever we play a section of the timeline that has audio from more than one audio source (camera, sound recorder, etc.) The audio was not recording with this buzzing, and it is not present in the source files. It has only happened with weddings, and it usually begins while we are editing a section that has 3-4 tracks from camera audio and 3-4 tracks from our Tascam audio recorders. Even if we disable some of the clips, and mute some clips, it still occurs. I have tried trashing preferences, deleting cache files, making adjustments to the audio hardware settings and nothing helps. I have spoken with Adobe support many times, and they have never figured it out. Please let me know what could be causing this.