Pop seems to have been fixed.

There is occasionally a slight bit of noise when switching between sources, but I don't think it's any more than there was before your changes were implemented. In other words, I think it's behaving exactly as desired.

I'm now working on balancing my inputs to the way I like them. At the moment, I think I've got a happy medium right here:

[hijack]
disable_bassboost_FM=1
volume_boost_FM=4
volume_boost_AM=-10

Since I don't have anything plugged into the Aux, I don't need an alteration to that input.

I'm still not certain about whether or not the disable_bassboost_FM is working or not. Anyone else want to take a stab at testing that?