I am running Nady EQ through the effects loop of my 5150. Two days ago I was playing my guitar and noticed that my volume started to drop. I was a little confused and didn't pay it much attention until I lost almost all sound from my amp. I tried changing cables, different guitars, anything I could think of. The amp works fine if I shut off the effects loop, but as soon as I enable the loop I lose volume. Also, it doesn't just lose volume, when I turn the amp louder it just sounds like it is underwater. Any help would be much appreciated.