Here at EmMeka Music, I use several methods to ensure your sound is crisp and clear. If you have the right equipment, you can even put these methods to work on your own!
I use this to get rid of back ground noise. With this tool, I set a noise threshold just high enough to capture the loudest most constant background noise. That could be a loud AC unit, room reverb, or even static or microphone feedback. Then I set my gate tool so that every sound under that threshold is either turned extremely low or completely off. I emphasize "most constant" because singular noises (i.e. an object falling, a cough or sneeze) can be isolated and removed from a recording.
Compression is the process of leveling out the audio wave to a degree. This helps reduce the difference between your loudest and most quiet sounds and make the audio more even and less dynamic. If you're like me and you speak with your hands a lot and therefore tend to move around a little while recording your podcast, this tool helps give you a more consistent sound.
It's very important that you record in the best environment possible to reduce background noise and room reverb. When there's lots of background noise, it can clash with your vocal making it harder to gate or remove. During compression, quiet sounds are made louder, so if that background noise is just as quiet as your most quiet vocal, it will be made louder when that quiet vocal is made louder during compression.
I use a limiter to (wait for it....) LIMIT the decibel level of the sound. Much like gating, I set a threshold at which the audio is not allowed to pass through. Anything that passes through that decibel threshold will simply be cut off and inaudible. Think of this as a reverse gate.
The process is obviously more technical and complicated, but this is a basic rundown of what you're getting with the Podcast Production Tier 2 & Tier 3 packages from EmMeka Music. If you want to know more, fill out the contact form and I'll send you a description of services.