OK, we alternate in our set between drop D and standard tuning. I use a tuner because I really have when bands tune full volume on stage. I use one of those standard Boss stomp tuner pedal deals (TU-2 I think). Why is that when I tune my drop D string the tuner says it's on but when I check it buy ear it is allways a little off? Is the Drop D to low for the tuner? Does anyone else experience this? Our guitar player has the same problem.