I have my PTZ Optics NDI 30x camera setup with a Senheiser MKE600 shotgun mic powered through our soundboard then output to the camera. We tested the camera multiple times with recordings and had perfect audio each time. We used the camera to record the board of ed meeting that night and all of the audio was gone from the recording. There are only three people with OBS downloaded and the capability to change anything in the building. Two are on PC Laptops and I am usually logged on through an iMac. One has not learned to use it yet and doesn't mess with it, one was recording that night, and the other is myself. The principal, who was recording that night, said he had input sound to OBS and even had to lower the monitor because he was getting an echo in the recording. All sources have sound to OBS loud and clear but when we record no sound shows up on the video. We had sound on the video that morning and something went wrong by the evening when we used it? Any suggestions would be greatly appreciated. I have been trying to find what happened and I can not get audio back on the recordings on any computer since this happened.