Good video can survive with average visuals, but poor audio is much harder to ignore. Whenever I record voice overs or tutorials, the first thing I work on is reducing unwanted background noise. Kdenlive includes a Noise Suppressor effect that does a good job of cutting down constant sounds like fan noise, computer hum, or air conditioner noise. I always recommend starting with noise reduction before applying any other audio effects because it gives you a much cleaner recording to work with. It will not fix every problem, but it can make a noticeable difference when your recording already has a decent signal.
Once the background noise is under control, I move on to the Equalizer, or EQ. EQ lets you adjust different frequency ranges in your audio instead of simply making everything louder or quieter. Low frequencies contain the deep sounds in your voice, the middle frequencies carry most of the speech, and the higher frequencies add clarity and detail. If your recording sounds muddy, reducing some of the lower frequencies can help. If your voice lacks clarity, a small boost in the higher frequencies can make words easier to understand. Small adjustments usually sound much more natural than extreme changes.
Audio editing takes a bit of practice, but learning these two tools will improve almost every recording you make. Start with the Noise Suppressor to remove distractions, then use the Equalizer to shape the sound of your voice. After a few projects, you will begin to recognize which frequencies need attention, and your videos will sound much more polished without requiring expensive recording equipment.
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