How can this guitar stay in tune?
My Martin OMC-15 seems to never go out of tune. My humidity went from 60% to 40% this weekend and I didn’t have to make any tuning adjustments? How is that possible? My other guitars seem to go out of tune with just a 5% difference.
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Taylor 816ce
Lowden O-32c
Gibson J-45 Rosewood
Martin OMC-15e
Martin OM-28 Custom
Taylor K66 Koa 12-string
Harmony H-162
...and whatever the next one is 
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