I can’t say enough good things about the Quilter. I run the Rusty Box into it, utilizing the pre-amp section of the Quilter. It helps to understand how the pre-amp section of the Quilter works (ha…hopefully I’m understanding it correctly). The depth knob is basically a HPF, and the contour knob acts in two ways, giving you a greater mid scoop as you turn the knob to the left or a LPF rolling off highs as you turn to the right. I think of the pre-amp as more of a utilitarian tone conditioner, rather than voicing, if that makes sense. I’ve also run the RB directly into the Quilter as a power amp and thought it sounded great. However, I keep the RB in the front of my chain because I prefer the sound of it feeding my other pedals, particularly dirt and fuzz. Hopefully that helps. I’ll be happy to answer anything else I can as well.