When the incoming level is a problem, you’ll want to fix that at the first step in the plug-in chain, utilizing any Input Gain control the plug-in provides (although some DAWs also have a Region/Clip Gain feature, which allows non-destructive adjustment of the audio file’s level on a per-region/clip basis, before it hits the first insert slot-another way to properly gain-stage the signal). If you’re used to dialing up, say, certain Threshold settings that you know should work well, a signal that’s abnormally hot or low in level may not react as expected, making the job of getting just the right degree of effect that much more difficult. An especially hot signal may be more than a certain plug-in is expecting, and reducing the input gain would yield better processing results-a good example would be a compressor, or any dynamics processor. The level might have been changed at a previous stage in the processing chain, or the audio file may have been recorded at too high, or too low, a level to begin with. There are various reasons why an incoming signal might be at an inappropriate level. But often, the incoming signal won’t be at the best level, and the plug-in’s processing may alter that level to a significant degree, and that’s when you’ll want to utilize these level adjustments. By default, these will always be set at Unity Gain, and they don’t necessarily have to be changed-if the incoming signal is at a suitable level, and the processing doesn’t drastically change that level of the outgoing signal, then it’s best to just leave them alone.
Most plug-ins have input and output gain controls that are provided to allow the user to adjust the signal level coming into the processor, and the level exiting the plug-in.
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