I produce a lot of screencams, and sometimes my voice fades at the end of the day, which can make the instruction muffled and less distinct. Audio compression is a great way to fix that, and it’s really convenient in Adobe Premiere Pro CC and Adobe Audition. Learn how in this tutorial.
Note that in addition to hosting the tutorial, Streaming Media Producer has a transcription of the tutorial with screenshots. If you prefer reading to watching video (or care to do both), check it out here.