Ducking specifically refers to lowering the volume of one track based on peak levels in another track. One track "ducks" under the other. It's related to a si

Ducking specifically refers to lowering the volume of one track based on peak levels in another track. One track "ducks" under the other. It's related to a side chain input on a compressor. Dynamically lowering a quiet signal is done by an "expander", or a "gate" if it's lowered to zero.