I gigged the new v4b last night. Overall, I'm definitely p!leased. It took me about a set to get it dialed in. I ended up just about flat with a slight boost in the highest frequency setting on the mids. The only thing I have to fine tune is the gain setting with my Roscoe. The amp sounded magnificent with my P bass, and good, but not great with the Roscoe. I think it will just be a matter of finding the sweet spot with the gain from the active bass.