I’ve got an LB30 and I had some interference once, it turned out it was a dodgy cab lead , but you said that you’ve tried that , maybe @Ashdown Engineering Can offer some advice 🙂
He’s an amazing recording engineer, I remember him well mainly from the 80s , I was involved in dub sound systems and many of his tunes were used then , usually very heavy basslines
I just thought I’d share this version of Poor man style , and at 5.11 it’s barrington Levy ,which he released around 1982, he’s always been top of my list for vocals, such a cool tune and a really nice Bassline to play.
I started taking bass theory more serious about 4 years ago, and the more I learned the more things started to make sense , and it’s now part of my practice routine in one form or another, imo @thebigyin it’s time well spent .