"compressors ... The threshold determines the sound level above which the the volume is reduced." Thomas Wilmering, et al. (2020). A History of Audio Effects. Appl. Sci. 2020, 10, 791; p. 13.
"The amount of volume change is governed by the ratio setting." Thomas Wilmering, et al. (2020). A History of Audio Effects. Appl. Sci. 2020, 10, 791; p. 13.
"A ratio of ... 10:1 results ... in a +10 dB change in volume on the input in a +1 dB change on the output." Thomas Wilmering, et al. (2020). A History of Audio Effects. Appl. Sci. 2020, 10, 791; p. 13.
"gain to boost the output" Thomas Wilmering, et al. (2020). A History of Audio Effects. Appl. Sci. 2020, 10, 791; p. 13.
"attack and release, determining how quickly the compressor responds to input levels exceeding and falling below the given threshold" Thomas Wilmering, et al. (2020). A History of Audio Effects. Appl. Sci. 2020, 10, 791; p. 13.