The Launcher update notification makes an annoying sound.

The FeedbackPanda Launcher uses your computer's built-in notification sound to deliver a notification whenever a new update is available. If your computer is configured to play a sound with notifications, that will likely result in a short sound played whenever an update is available. 

If you want to turn off notification sounds, here is how to do it:

• Windows:

Windows 10: https://www.laptopmag.com/articles/turn-notification-system-sounds-windows-10

Windows 8: https://www.isunshare.com/windows-8/turn-notification-sounds-on-or-off-in-windows-8-8.1.html

Windows 7: https://www.youtube.com/watch?v=il-EZIXiYp0

• Mac OSX:

https://www.imore.com/how-enable-and-disable-notification-sounds-your-mac