I really like the tuner. My Fender blue box tuner was impossible to use on a gig with other instruments tuning up. The Meisal ignores the background noises and is easy to see as it changes color from blue to green. But, can anyone explain the reason and/or purpose of the flat (b) and double flat (bb) modes? The tuning note A-440 can be adjusted through a large range of the 400s, so why the above mentioned settings? They sometimes get in the way by getting clicked on accidentally. The flat symbols are small and hard to see from a distance as when clipped onto the scroll. Thanks.