My $0.02, living in Sydney Australia, is that nylgut mitigates some of he effect of fairly extreme weather changes. We can have a thunder storm roll in and have the temperature drop by 10+C in the space of as many minutes. Gut just gives up in those circumstances.
Part B of this is the effect of the weather on the wood of the instrument. One of my lutes is more stable than the other in the pegbox department. When we are in a changing time, I am forced not to play this instrument for days at a time (I really don't enjoy the tune, tune, tune aspect). Then, isn't there the old adage of lute players spending half their time tuning and the other half playing out of tune? This is not a new problem, though I do believe that synthetics help. Kind regards -- mark. To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
