We will look at different examples of how and when to use them. First of all lets take a look at what they do. Compressors alter the signals entire dynamic content.
Threshold is the point set to start modifying the signal.
This is usually variable depending on the unit itself. Ratio is the amount of ch ange you want to happen. Also most units have adjustable attack. This adjusts the speed of change in signal. Release is how long the signal is in modified state.