doc-phil wrote:
I always use Ernie Balls beefy slinkys or not even slinkys, and I change them about every 2 - 3 months. I also haven't noticed any changes accoustically.
And where are you in that cycle now? I'm a harmonic nut and change my strings every 3 - 4 weeks as any older than that and they start losing too much brightness and tension (and yes, harmonics are affected by both).
Could it not be that the stock standard epiphone pickups are getting a bit tired?
Unlikely. It takes a looong time or a powerful magnetic field for magnets to degauss.
One thing that does come to mind is that I use the noise suppresor on my multieffects pedal on max to cut out all the buzzing.
If you've got it set high, then it won't help as harmonics are usually quieter than normal notes. Added to dull strings it will affect harmonics.