How does one silence mountain lion startup sound?

After asking this question many times and always getting the ususal fixes (that don't work in Mountain Lion) Psst, Startninja, turn down the sound when you shut down, yada yada yada. And the "why don't you just put it to sleep" comments :/ duh.. Sometime we want to shut it down!! Even Apple support has no idea how to do it. Here's is the fix and it is so simple it hurts.
Controlling the volume of the startup chime is easy to set in the System Preferences Sound panel, but you need to make two different settings if you have external speakers connected to your Mac. There is no need to use scripts or any other coding to make this adjustment.
There are both internal and external speaker output settings in the sound preference pane. In order to adjust (or turn off) the volume of your Mac's internal speakers, nothing must be plugged into the headphone jack. Keep in mind that this setting completely controls the volume of your internal Mac speakers, so if you mute the sound, and have no external speakers, you will get no sound at all from your Mac.
To adjust the volume on your Mac's internal speakers:
Unplug speakers or headphones from the headphone jack.
Go to System Prefs > Sound, then click on the Output tab.
You will then see Internal Speakers (Type built-in) highlighted in the window.
Adjust the output volume (which also controls the chime volume) in the slider at the bottom of the window. Remember if you mute it there will be no internal speaker sound.
To set the volume for your external speakers:
Plug in speakers or headphones to the headphone jack.
Go to System Prefs > Sound >, then click on the Output tab.
You will then see Headphones (Type built-in) highlighted in the window.
Adjust the output volume (which controls the chime volume in the external speakers) with the slider at the bottom of the window. Remember if you mute it there will be no external speaker sound.
http://hints.macworld.com/article.php?story=20120513121111656
Lovin my Mac but thanks for nothing Apple support and community on this very easy to adjust issue.

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