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Thank You BOSS for great price performance we all look for in top line product!!!

My only guess is that the slight excitation of the fresh, bright, new lower E string was interfering with the unit picking up the string actually being plucked

And, as with some other brands, I sometimes had sensitivity problems tuning the low E on basses (and the low B on 5-string basses)

Starting on the E string, it got that right; moving up to the A string, it was still showing "E" on the display, even though fretting the E a fifth up showed me that my A string was within a halftone of being in tune, for sure, but the Boss kept displaying "E" ... the same happened with the D string as well