well first thing you need to do, i think, is realize what a compresor is used for and learn all the knobs. A compressor is used to make loud sounds quieter and quiet sounds louder, to kind of even everything out I guess. Like if you had a sample that had a guitar and a violin, but the violin was way too loud. You could compress that sample to start taking effect at the dB the violin is at and it would make the violin quieter and the guitar louder. To use it successfully, you have to know what all the buttons and knobs mean. The threshhold is the dB the compressor starts compressing at. Set this at the level of the sounds you want to compress. The ratio is how much it decreases the level of the sound once it reaches the threshhold. So say you had a ratio of 3:1 that would mean that if the sound was 3dB it would reduce it to 1, if it was 6dB it would reduce it to 2 ect. The gain is exactly what gain is on any other program, to raise the volume. There are some other buttons that i dont have time to explain right now but ill check back later and see if i helped at all.