I've never played a 7 or 8 string. Although I really want to! But, no... I have no advice for you. Sorry.
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No problem. I know I'd have better responses on an actual guitar forum, but I typically avoid those sites as I've noticed a lot of douches on various ones.
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Have you tried Ultimate Guitar?
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Other than tabs, I don't care for that site too much.
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They community is a lot more mature. Try their forums.