Hello Community, it's been awhile since I've been here. I have a MTD Z5, which I am very satisfied with, but, recently, I have been getting a very distinct humming from my amp setup ( Markbass 2x10 cab w/Little Mark III head ). The humming/buzzing occurs when I turn up the volume on the bass. No audible noise, at any other time. I've tried several other cables, same result. Interesting tho, I plugged my other bass, Marcus Miller M2, into the amp, using the same cables, no humming/buzzing, whatsoever. I researched the issue, online. Seems like, it maybe an issue with grounding inside the bass. Any thoughts or suggestions on what I need to do to rectify this problem? Thanks in advance!!!