Compressor Threshold

When the signal’s amplitude (level) exceeds the threshold setting, the compressor engages. As the threshold is lowered, compression begins at a lower amplitude (volume) and further limits the dynamic range of the signal.https://www.presonus.com/learn/technical-articles/How-To-Use-Dynamics-Processing-Getting-Started-With-Compressors-Gates-and-More For more information on Compressors, please refer to this article.