I'm in a quandry, one of my all time fave pedals is acting up and I'm asking for basic advice/help. I'm not very technically capable with the guts of electronics but, to my novice eye everything looks to be working fine, but I get no sound out of the pedal, just hiss. Both leds light up, I know I'm using good cables, the battery's fine. Are there any basic tests I can run with a multimeter that would help me figure out what's going wrong. BTW, I don't know about contacting Mike Fuller, I had the pedal modified. It's a 99' flat mids version, but I had a toggle switch installed that engages the mid-hump resistor. So, it's like having a red FDII and the blue FDII in one pedal. But, I've basically voided any warranty and I don't want to trouble the guy. Many thanks--happy holidays. Oh, btw, I got the MI Audio Tube Zone the other day. Whoa, verrry nice pedal. Ken.