One of the most powerful tools in your arsenal as a sound tech or video editor is the compressor. This piece of equipment (or software) will not only improve the sound of your mixes, but it will save you a ton of time by bringing your tracks into a manageable dynamic range. I love to see the look on the face of church sound techs when I first plug in a compressor and add it to their vocal mics. It makes a huge difference in quality and in the ability to keep each singer's volume consistent. Disc Makers has an article that describes compression in simple terms and also includes some samples so you can hear exactly what it does. Take a minute and go check out the article.