Hi folks, this is really driving me crazy, so let me explain I have an Electro Harmonix Bass Big Muff that I got specifically for its dry/effect feature. As you probably all know, it has two outputs, one for the distorted signal and one for the unaffected bass signal. I actually quote from its instructions page: "Direct Out Jack - is connected directly to the Input jack to allow access to your original bass signal. You can connect this jack to an amplifier or different effects chain." And that's exactly what I did! I kept two separate signal paths, and I joined them back just before the amp, with an EHX Switchblade, with both channels A and B, turned on. Like in the diagram below. When I have the Bass Big Muff on, no problem at all. Just a tad of grind below the other effects (I don't use much distortion). Bit if I turn the Big Muff OFF... ALL HELL BREAKS LOOSE!!!! A wild, howling, strange electronic feedback kicks in!! Kind of "WEEEEEAAOOOOOOOUUUUUURRRRRR!!!!" Un-usable, to say the least! What's the problem, here? Is it the Big Muff that has a bug or a defect, or is it a peculiar behavior of its own? I couldn't find anyone among my bass-playing friends who could lend me an identical pedal so I could check wether this working condition is just a glitch of my own stompbox or is typical of ALL the Bass Big Muff pedals! Anyone has any idea ? Cheers!