SilentStartup 1.5 - Ah.

Name: SilentStartup
Version: 1.5
Mac Platform: Intel
Includes: Pre-K'ed

OS version: 10.10+
Processor type(s) & speed: 64-bit processor
RAM minimum: N/A
Video RAM: N/A

WHAT'S NEW

- El Capitan support
- small improvements


More info: https://itunes.apple.com/us/app/silentstartup/id575545858

With SilentStartup it's easy to (temporarily) mute the startupsound of your Mac. You can also indicate that you want to keep the sound muted after the startup. This comes in handy when you use the facility to start your mac automaticly and don't want to be disturbed by any sound. It's easy to unmute the sound manually after startup, in the usual way.

*NOTE* When you use a headset or external speakers through the headset port or USB, the startup sound can't be muted! You have to remove the headset or speakers before closing down and reconnect after startup.