okay, so i just got a chance to play my new bass that's loaded with EMGs (35dc's) and an emg preamp. plays nice, sounds awesome, one small problem. my band plays in drop-c, so i tuned c-g-c-f, just like always. went into the first song, and something sounded wrong. guitars checked their tuning, they were on. i went to my rack tuner and checked. i was dead-on. try again, same result. i'm out of tune. so i go to the guitarist's tuner (a boss pedal tuner) and it says i'm dead on as well. try again. still out of tune... i figure i'll just adjust. i wind up playing everything up one fret. so i go back to my tuner, and tune c#-g#-c#-f#, and everything is fine. this tuner worked last week perfectly with my stingray, and has worked perfectly for the last 2 years with a variety of basses. why all of a sudden am i tuning half a step up? i checked and rechecked with my tuner, and the guitarist's tuner. ever time they both said i was on, i was off. when i jumped up a sharp, i was fine... any and all help is greatly appreciated!