CC0 Public Domain. Recorded on Tascam FR-AV2 32bit 192khz. Using Rode NT5 Microphones in a XY configuration. Trimmed the first squeeks of closing and opening the door. Slowed down the recording to 48khz (sampling rate), (1/4 the original speed) Applied a 5khz HPF (So 20khz IRL speed) normalized the sound, slowed it down even further to 16khz (sampling rate) to further hear anything in the ultrasonic space (now at 1/12th IRL speed). A fair bit of gain has been applied. All in all, you're hearing anything above 20khz. 20khz is now 1666hz. 96khz (half of the 192khz sampling rate) is now 8000hz. Curious for any ideas why left side starts buzzing first and last compared to right side. And what that "white noise" buzz might actually be. rec 20250422 Original : <a href="https://freesound.org/people/Sadiquecat/sounds/801772/" rel="nofollow">https://freesound.org/people/Sadiquecat/sounds/801772/</a>