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How can I permanently mute the start-up sound on Lion?

StartupSound.prefPane isn't compatible with Lion. I found Psst, and I guess it's the best option, but it still looks like a hack. Any better ideas?

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Would a shutdown item that mutes the volume be acceptable? – bmike Dec 3 '11 at 6:59
@bmike that doesn't sound like too bad an option. Do you know how to do that? If so, can you post it as an answer? – Drew Dara-Abrams Dec 8 '11 at 22:03

Before I start up my MacBook in the library, I plug in a headset or earbuds (from my phone or iPod). Hardware mute. Works with either OS.

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Maybe not the answer you are looking for, but:

I keep the volume of my MacBook to zero (so no sound on startup) since I do not want sound without earphones or my stereo connected anyway - Mac OS saves different volume settings for “something plugged in” and “nothing plugged in”.

At least, works for me.

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