So, one of the main things that led me to get rid of my PodXT Live was that, its compressors really really sucked.  By the time you finally got the sustain right, the attack was sooo horrible that it was completely unusable. All I got was a wretched "thunk" sound on the attack - all bass and no highs. I've used guitar compressors for a long time and never had any of them do that except for some of the early Boss compressors.  I hope that some of you can assure me to some degree that they, Line 6