I use a hardware expander/gate, but you can do the same thing with software. I like the hardware option because it can save a step in or even eliminate the need for audio editing. By the way, a noise gate mutes a signal if it falls below a set threshold. For example, you can set the gate to block background noise from an air conditioner. However, when you speak while the air conditioner is running, its noise will still be recorded. This is where an expander comes in, as it can reduce the volume of the air conditioner noise.
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