I've been using a Boss TU12 Chromatic tuner for years on my 12 string guitar and 4 string bass. I recently purchased a 5 string bass and am having a tuning problem. I can't pick up my B string when tuning. Maybe the tuner can't pick up the lower frequency of the B string??? I'd rather not have to buy another tuner but if that's the case, I'm interested in a rack mount tuner(I've already got a handheld!).... any suggestions from experience? I'm contemplating the Korg DTR 1000 or the Sabine RT7000. Thanks!!