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Those trusses look pretty old. I'm sure they are still good but I would be concerned about how much weight you can safely add to them. They might be fine with just the drywall but then what if you add 3 more layers and a huge cloud that weight? That might add too much stress. I see you're in San Diego so I imagine there's no concern with snow loads. You might want to discuss this with an engineer before you start.
As for isolation you probably need to do the same thing on the ceilings as the walls. Add mass. Two layers against the roof sheathing. Then two layers as your second leaf.
Traditionally if you have a vaulted ceiling the joists the drywall hangs from are not the ones that hold up the roof. This should be framed in under the existing structure with less pitch (angle). I recommend getting a carpenter with a lot of experience to do this (whether it's flat or vaulted). I wouldn't do this myself without guidance. There are a lot of things that you would never think of when it comes to trusses. I'm not a framer anymore and I didn't spend a whole lot of time in that side of the business. I could be wrong but framing trusses always seemed to be the tough part. Most times the trusses were pre-made to take out the human error. Especially in vaulted areas. I'm not trying to scare you. I just don't want your roof to come down on you.
Anthony
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