A typical use of this effect in a daily radio production routine is for creating a voice-over: a foreign language original sound is dubbed (and ducked) by a professional speaker reading the translation.
A typical application is to achieve an impression similar to the "pumping" effect.
[1]: 94 Ducking may be used in place of mirrored equalization to combat masking, for example with the bass guitar ducked under the kick drum, resembling subtle side-chain pumping.
[1]: 97 Used most often to turn down the music when the DJ speaks,[2] ducking may be used to combat the muffling and distancing effect of reverb and delay.
Clear examples include Céline Dion's "The Power Of Love" where the reverb and delay become audible when Dion pauses; and Adele's "Cold Shoulder".