I bought a Korg tuner today, mainly because I have trouble keeping the bass strings on my guitar in tune.
It's a good metronome and a fair enough tuner. I proceeded to tune my guitar and my son's bass. I discovered a strange effect on my low E string. The open string E is in tune, but the first fret F is almost 50 cents sharp. The tuning gets better as I go up the fretboard. I always thought that string sounded a bit strange, but that F is darn close to an F#. The other strings don't have that problem.
Anybody have an idea why this might happen?