Im just starting too understand and use compression and what it does for me is: making the attack and volume across my strings more equal, particulary fattening up my D and G strings and for example make sure my slapping doesnt disappear in the mix when i switch from fingerstyle too slap midsong. I do only like a small amount of compression and I only like it when my peak isnt limited too much and the compressor is slow enough too maintain my attack. EBS multicomp does this well
