Once the threshold is met, the gate “opens” and lets everything through.
Noise gates work by completely cutting off the signal until the threshold, which is controlled by you, is met. If you want to know exactly how every different component in a compressor works, what the knee, the ratio, attack & release do, then here’s an article where I explain just that! What does a Noise-Gate do? Using a compressor while playing music is a great way of keeping the dynamics consistent, but it’s also the best way of adding punch to your mixes and to even everything out to keep some random loud volume spikes from poking their head out. It also adds sustain to the signal (when playing guitar, bass, etc., for example) since it keeps the signal from dying down. One thing to note is that compression does affect the tonal characteristics of the track, which is actually what a compressor is used for most of the time, to make the track sound “punchy, smooth, in your face, etc.”. Of course, going overboard will kill the dynamics of your music making it sound stale and lifeless. Essentially, it increases the volume of the overall audio file while decreasing the volume of the loudest parts so there’s not that much of a difference between them. A compressor is designed to lower the dynamic range between the softest and the loudest sounds in an audio file to make everything more even.
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