istic ated ▁ways ▁where ▁a ▁signal ' s ▁volume ▁is ▁del ic ately ▁lower ed ▁by ▁another ▁signal ' s ▁presence . ▁D uck ing ▁here ▁works ▁through ▁the ▁use ▁of ▁a ▁" side ▁chain " ▁gate . ▁In ▁other ▁words , ▁one ▁track ▁is ▁made ▁qui eter ▁( the ▁du ck ed ▁track ) ▁whenever ▁another ▁( the ▁du ck ing ▁track ) ▁gets ▁l ou der . ▁This ▁may ▁be ▁done ▁with ▁a ▁gate ▁with ▁its ▁du ck ing ▁function ▁engaged ▁or ▁by ▁a ▁dedicated ▁du cker . ▁ ▁A ▁typical ▁application ▁is ▁to ▁achieve ▁an ▁impression ▁similar ▁to ▁the ▁" p ump ing " ▁effect . ▁The ▁difference ▁between ▁du ck ing ▁and ▁side - chain ▁p ump ing ▁is ▁that ▁in ▁du ck ing ▁the ▁at ten u ation ▁is ▁by ▁a ▁specific ▁range ▁while ▁side - chain ▁compression ▁creates ▁variable ▁at ten u ation . ▁D uck ing ▁may ▁be ▁used ▁in ▁place ▁of ▁mirror ed ▁equal ization ▁to ▁combat ▁mask ing , ▁for ▁example ▁with ▁the ▁bass ▁guitar ▁du ck ed ▁under ▁the ▁kick ▁drum , ▁res emb ling ▁subt le ▁side - chain ▁p ump ing . ▁A ▁du ck ing ▁system ▁may ▁be ▁created ▁where ▁one ▁track ▁du cks ▁another , ▁which ▁du cks ▁another , ▁and ▁so ▁on . ▁Ex amples ▁include ▁Port is head ' s ▁" B isc uit ". ▁ ▁U sed ▁most ▁often ▁to ▁turn ▁down ▁the ▁music ▁when ▁the ▁DJ ▁speak s , ▁du ck ing ▁may ▁be ▁used