I use a Big Muff a lot.
Got a new one, plugged it in and it worked fine. I used my Blues Deluxe, had my Strat plugged into the first insert and had all the cables in the right spot.
The third time I used it nothing would happen. I could play fine with it not on but when I pushed the button down to use the pedal no sound would come out of the amp. I double checked the way everything was plugged in--good. Checked the cables--good. Checked the battery--it was good. I went ahead and put a new battery in it just to be sure--still would't work. The pedal was never dropped.........Any ideas anyone??