Hi! I have come across a fantastic series of tutorials on what does a compressor do and how it does it. I've always used my compressor in a sort of newbie manner, not really knowing precisely what the knobs do. I suppose it's the case for many beginners. Anyway this tutorial I found on youtube is very clear and pedagogical and it helped me lots to understand in detail and in depth the ways of the compressor. The tutorial is mainly made for (home) studio compressor but it is the same for the ones we use a bass players. Here's the first video: The guy does quite a good job at explaining stuff, and even though it's sometime a tad repetitive, it's very very instructive. I hope this helps!