[quote name='chud' post='819092' date='Apr 26 2010, 12:28 PM']What method do you use?[/quote]
Change strings the day before and give them a fair 10 minutes of heavy slapping to "egalise the tension", well to prevent from detuning.
And - I never record with old strings, as "51m0n" already said, you can always take things from the sound but never add what's not in it.
Tom