Sound Problems After Installing Lion

I see many are having issues with sound after installing Lion. I have sound and then will lose sound after closing and reopening. I have to restart to restore sound. This is getting old quick. Does anyone know a fix or if one is coming? Thanks!

Not sure how much it helps, but here is my experience:
I have found that after a while, midi-style sounds stop playing. Most obvious to me is the crinkle tune when throwing away trash, or the click when placing something into the trash. When these sounds stop playing, I can still set the volume (and the up/down volume sounds will play) but the midi tracks don't start playing.
A while back I was hunting for a solution to this problem and rebooted and messed around, etc, etc. One person suggested changing the midi format since they knew there was a bug in the midi playback in Lion (a beta comment I think). So I used the Audio MIDI Setup application to change the Built-In Output format to 2ch-32bit float. For a while the sounds were back.
Just now, I noticed that they had disappeared again, so I went back to Audio MIDI Setup and changed it back to 2ch-24bit Integer. All of a sudden, a stream of old sounds started playing - presumably everything that had not been correctly played for a while.
Not sure if it will work again, but next time the sound vanishes, I will try to change the format again and report back what happens. My guess is that just changing the format will cause the queue to reset and play any old sounds. Then the sounds will work for a while until the bug is triggered again. Perhaps the workaround for now is to just keep flipping the Ouput MIDI format?

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