First of all, I'm kind of a novice when it comes to upright amplification. I've more or less avoided it in the time that I've been playing upright and only now have been put in a situation where it is required. Anyways I figured that I'd save a little bit of time and use my Korg Pitchblack tuner from my electric rig. However, when I engage it in true bypass it pops. This only happens when I use it on my upright. Does anyone know what might be causing this and how I could fix it?