AGC settings in new 3.2

I would like to know, if possible, at what levels do the AGC settings operate...when I scan for clicks at detection level 3, if I set the AGC at 1--does it ignore all clicks detected above -10db or maybe its -6 db?--at AGC 2 is it say -20db or -12??
I've read that each bit in a digital recording is roughly equvilent to 6db (not sure) per bit, making a 16bit cd about 96db s/n.
Maybe at a level of 1 it ignores detections if the most significant bit is high and it level 2 the next most--and so on. The reason I would like to know is sometimes when I record to cd, I tend to set the levels a bit low to avoid running over 0db. If my loudest peak on the recording is -7db does setting the AGC at 1 do anything?---I always could normalize to -1 before scanning for clicks, but thats not always possible with classical music when some tracks are a lot louder than others.
I've read that each bit in a digital recording is roughly equvilent to 6db (not sure) per bit, making a 16bit cd about 96db s/n.
Maybe at a level of 1 it ignores detections if the most significant bit is high and it level 2 the next most--and so on. The reason I would like to know is sometimes when I record to cd, I tend to set the levels a bit low to avoid running over 0db. If my loudest peak on the recording is -7db does setting the AGC at 1 do anything?---I always could normalize to -1 before scanning for clicks, but thats not always possible with classical music when some tracks are a lot louder than others.