I got a G2 in fro repair. Customer said the unit did not sound right and seemed to have low output. He sent the unit to me to check out. What I found was the level pot on the back of the G2 had not been turned or used probably for some time. when I first turned it I got a crackle and scratchy sound, after turning in back and forth few times it cleared up. The G2 now sounds good. I suspect the problem was the level pit had not been used and a bit of dust, dirt, or corrosion had built up on the on the pots swipe contact and had caused bad connection or continuity to the insert input return level. So if you use the insert return as your input and sound seem low, try turning the level pot back and forth few times and see if that brings your output back.