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