Hollis, I was considering it, but never acted. I love the tone the way it is and I guess I couldn't imagine that I would ever want to turn it off. I suppose there are a few more tones in there that I can't reach, but I can't say that I am missing them. As simple as I thought the Persuader controls were, very subtle tweaks to the filter make such lovely changes to the tone that work so well. If I had a Europa, Signature, or Series bass to A/B it with, I might change my mind. Maybe I just don't know what I am missing.