this doesn't contradict what i said, if Chester recorded his parts in the same studio. they were live in the same area before Chester joining and after, it's logical to think that they recorded at the same place.
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i'm wondering about the time between Mark leaving to Chester Joining, what they did meanwhile? they wrote something? they recorded something? there are demos with another singer/s? (not Mark or Chester). but we don't have who to ask about it. maybe we should ask Rob.