Fellow TBers, just need some help and advice. I play thru an Aguilar TH 500 head into a Markbass 15 in, CLUB cabinet. (use two cabinets for some gigs -additional 12 in Markbass) I have been exploring the PorkLoin pedal and enjoying its goodness, but when I push it some for grind, my cabinet is doing something odd, I guess the closest to call it would be a slight "farting out" type sound. I don't believe my cabinet is blown, is there some other explanation for this? Maybe I need to tighten down the screws on it?