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Title: Can't tune a piano with Korg CA-40
Review: Korg CA-40 is advertised as having a range capable of tuning an entire piano keyboard - A0 to C8. It cannot and I've tried it on 5 different pianos. It doesn't pick up the bottom octave and a half nor the top two octaves. It just stops responding. When you're in the center of the keyboard, it works good and the display is easy to read but being that it's advertised range is not even close to actual, I am forced to give it a low review score.
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