is it true that changing string gauges will mess up the neck/truss rod, and you have to ajust it, because I am going to change from dario 9's to dario 10's. so do I need to ajust the truss rod and which way?
No, only if you're changing from 9s to 13s or something. 9s to 10s is not much of a change really.
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how about from 9s to 11s?
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how about from 9s to 11s?

"...I tell them if its sounds good it's good, no need to change..."

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