Barefoot, connect a bass direct into a board. Hit any string or note followed by amy chord on a git or keyboard. At beginning of sound wave thru board,note will sound out-of-tune (1st millisecond of wave) then revert to original key or note
selected. Now there are times when using a stringed instrument w/active pickups eliminates this phase prob, other times when bass hits root of chord,sonic appearances indicates tha bass is out of tune until that,for want of a better phrase,millisecond phasing passes of which bass note returns back to root of chord.
I've experienced this prob with Ibanez,Squires,Shecters but not with Precisions or Jazzes. A prime example is when this weekend during our East Coast fest, Hard2Hear inputted bass into DI,mic'd amp and phase probs were completely eliminated. Prior to hook up,I didn't even waste time trying to tune due to these factors as
"phasing" would rear it's ug-mo face!
BTW,when I refer to phasing probs,I'm not referring in the "STEREO" sense but in the pitch sense,like a fast,unwanted Phase-Shifter effect.