Im sure there are already a few threads on here about the big muff, but I'm new on here so forgive me if someone has already answered this problem. The other day I bought a Bass Big Muff Pi off of Amazon, recieved it in good packaging and good quality. I bought a power supply and a new lead to connect it up to my amp, engaged the effect, and it sounded great! I then turned the effect off and it muted the signal completely. It confused me because I thought that would have affected the engaged effect, but it works fine when using the fuzz. Any help at all? The dry out has the same issue, great clean sound im used to, but only works when the light is on! Please help!