Sidechaining synths to the kick and snare creates the pumping that lets drums cut through

In dense electronic mixes the sustained synths (pads, bass) mask the drums. Sidechain-ducking the synths from the kick (and often the snare) drops their level momentarily on each hit, producing the rhythmic ‘pumping’ effect and clearing space so the drum transients cut through. It can be done with a sidechain compressor or a volume-shaper plugin (e.g. the free STFU, an alternative to LFO Tool) whose gain envelope is triggered by the kick. The duck should be deep enough to breathe but shallow enough that the synth still has presence between hits. The same technique glues the bass to the kick, preventing low-end clashes.

Examples

Bass/pad track → volume shaper (STFU) triggered by the kick, ducking each beat. Or a compressor with the kick as sidechain input. Set the duck depth so the pad audibly pumps but doesn’t disappear.

Assessment

Apply sidechain ducking to a pad using the kick as trigger. Adjust depth to find the point where the drums cut through but the pad keeps presence. Explain why this frees up the mix.