UPDATE* After some back and forth communication with customer service from COMICA, they have acknowledge the "Underwater sound" produced by the De-noise mode in the audio captured and their tech team is currently troubleshooting it. They recommended that unless you are outside in a windy or noisy environment that you need to have the De-noise mode OFF for best audio recording during indoor usage. That being said this is still a fantastic upgrade from the VM30 and still worth its weight in gold. Hopefully there with be a firmware update for both the RX/TX to eliminate the De-noise mode issue in the months to come. I will post a link to that in the description if that becomes available. Thanks!