I have a couple cheaper pedal tuners. One is a Joyo and the other is a Rowin. The tuning accuracy of both is fine, but on both when the LEDs light up there is an audible tapping noise through the amp. At home at lower volumes it's not a big deal, but in a performance situation with a loud amp it wouldn't be desirable. I was thinking about getting a Polytune Mini, but not if it's going to make that noise. Is this an issue with all tuners that use an LED display, or is it just my cheap ones?