I made my spider IV do this once. I wanted it to sound like a guitar and bass at the same time. So I could achieve a "Royal Blood" sound. I was able to do so for a while too. Then something unexpected happend. My amp stopped producing a quality sound. With master volume set to half. I was hardly getting a sound. Barely any distortion when active. I'm not sure what heppend, it just felt like the amp died. Anybody have comments on this?