I have two different overdriven tones that I really like. The first is through the DP-3X pedal. It nails the dUg tone, can get close to a Chris Squire style tone, and can do other things too. It's also really good at bringing back some of the top end lost from dead strings if you're like me and don't like spending all your money on bass strings. 2nd one would be a split patch tone I use on my Helix, mostly for recording. I have the top end going through the B7k pedal model, and I keep the low end clean, save for some compression. The whole signal gets combined again, some EQ, and a little more compression to top it off. I would say it's inspired by Nolly's tone on the earlier Periphery songs. Probably would be allot closer if I had a Dingwall, which is on my short list. Both of these work with any of my basses, including the fretless. They both sound more aggressive with the Thumb, probably due to it's inherent mid-forwardness, and pickup placement.