OK, I did a search and didn't find anything on this topic, so here goes. I bought a MXR BEF and tried it with my Warrior with dual humbuckers (Barts). I've tweaked the pedal every way you can, tweaked the settings on the bass (even made it as trebly as possible and also just using the bridge pickup) and still can't get a decent quack out of it. Yes, I've tried playing very percussive, even with a pick too, to no avail. While this is my first filter, and I've read a TON of material here on TB about different filters, and I just don't think it's my type of filter. I want to love it and get it to quack really well. I'm going to try it with my jazz bass and see if the single coils and its' preamp give me anything different. However, the Warrior is my main player and will continue to be. Any suggestions/opinions?