I need help here. I'm learning about recording at college, we've done stuff on mics, on desk settings, and lots more, and now we're onto Compression. Thing is, I'm missing why it's done. I've recorded something so far, without compression, and they've sounded good. Yet my teacher was talking as if applying some compression is essential. I'm not even sure what compression really does. Why is compression used when recording? What is it used for? What happens if you don't use it? Basically, can someone explain compression and its uses from the ground up? Because I am really clueless on the issue. Thanks in advance.