Have you considered updating this for iOS5 (new memory management, etc)

Thanks!

However, I use a different step and it work too

1. Change Play Sound Effects Thru from the set device, in my case Internal Speakers, to other device, in my case Soundflower 2ch
2. Change Alert Volume level by sliding the slide bar to a new location
3, Switch Play Sound Effects Thru back to the desired device, in my case, from Soundlfower 2ch back to Internal Speakers
4. Chnage Aletr Volume level back to the desired position

The sound effects will come back.

But I want a permanent solution so that sound effect will not stop working if I hibernate my Mac or in many case, just sleep my Mac by closing lid

To do this, Shut down you computer.

Hold down Command, Option and the P and R keys and restart your computer while holding these keys down.

Keep holding them down until you hear three reboot chimes. There will be a few seconds between each of the three chimes.

After the third chime you can release the Command, Option and P and R keys.

There may be a fourth reboot chime after you release these keys but that is not something to be concerned about

This process resets your PRam (Perimeter Ram) which controls some of the computer sounds

Open your trash. There should be a “recovered files” in the trash. Empty the trash and you should hear the usual sound that goes with that action.

Open your System Preferences, go to the Sounds icon and open it. Select Sound Effects and click on the various available sound effects. if they produce sample sounds for you.

YOU NOW HAVE YOUR SOUND EFFECTS BACK.

This is a great tutorial. Did you upload the enhanced one?