What Is Sidechain Compression? How to Make the Kick Cut Through

The short answer: sidechain compression is a compressor on one track that listens to a different track to decide when to compress. The classic use: a compressor on the bass (or synths) triggered by the kick, so the bass dips for a split second on every kick hit. That clears space in the low end so the kick punches through, and at heavier settings it creates the rhythmic "pumping" that defines house, EDM, and much of modern pop. Subtle settings fix a mix; heavy settings become the groove.

Sidechain is on the low end of nearly every dance record I've released (Sony, Universal, Ultra, Dim Mak), sometimes invisible, sometimes the whole feel of the drop.

How it works

A normal compressor reacts to its own signal. A sidechained compressor reacts to the trigger instead. Whenever the kick crosses the threshold, the bass is compressed, then recovers over the release time.

Settings: subtle vs pumping

The release is the musical control. Set it too short and the bass snaps back awkwardly; too long and it never recovers before the next kick. Timing it to a note value makes the pump breathe with the track, and the delay time calculator gives the exact ms for any tempo (at 128 BPM, an eighth note is 234.38 ms).

Setting it up

Ableton Live: put Compressor on the bass, open the sidechain panel, enable it, and set Audio From to the kick. Pull the threshold down until you see the gain reduction you want.

Logic Pro: insert Compressor on the bass and choose the kick track in the Side Chain menu at the top right of the plugin window.

FL Studio: route the kick's mixer track to the bass track using "Sidechain to this track", then set the sidechain input on Fruity Limiter (in compressor mode) on the bass.

A ghost kick (a muted or silent kick pattern used only as the trigger) keeps the pumping consistent even in breakdowns where the real kick drops out.

The volume-shaper alternative

Many producers skip the compressor and draw the ducking shape directly with a volume-shaping plugin or an LFO tool synced to the tempo. It's more predictable and pumps identically on every beat, since it doesn't depend on the kick's level. Either approach works; shapers are common in EDM, compressors in more organic mixes.

Other places sidechain helps

• Vocal delays and reverbs, ducked from the dry vocal so they bloom in the gaps: how to sidechain a delay.
• Instruments under a vocal, lightly ducked (often with a dynamic EQ band around 1 to 4 kHz) so the vocal sits on top.
• Bass under a sub-heavy kick with a narrow low band only, via multiband compression.

Sidechain works best on a mix that's already gain staged properly, since thresholds depend on the trigger's level. Where it fits in the whole process: how to mix a song.

Quick answers

What does sidechain compression do? It turns one track down whenever another track plays, most often dipping the bass on every kick so the kick cuts through.

Why is sidechain compression used in EDM? To give the kick room in the low end, and at heavy settings to create the rhythmic pumping that drives the groove.

What release should I use for sidechain? Around 50 to 150 ms for a subtle fix, or a note value timed to the tempo (often an eighth or quarter note) for musical pumping.

Is sidechain compression the same as ducking? Yes, ducking is sidechain compression that lowers one sound in response to another. The term is often used for vocals and effects returns.