If you've ever wondered how professional tracks get that pumping, breathing energy — where the kick cuts through perfectly every time and the mix feels alive and moving — the answer is almost always sidechain compression. Here's how to use it.
What Is Sidechain Compression?
Normal compression reduces the volume of a signal when it gets loud. Sidechain compression reduces the volume of one signal based on the volume of a different signal.
The most common use: you put a compressor on your bass, but instead of triggering it from the bass signal itself, you trigger it from the kick drum. Every time the kick hits, the compressor activates and ducks the bass down. When the kick stops, the bass comes back up. This creates a rhythmic pumping effect and ensures the kick always punches through clearly — because the bass literally gets out of its way on every beat.
The result: your kick and bass no longer compete for the same space. The kick has a clear moment of impact, and the bass fills in around it. The mix sounds cleaner, punchier, and more energetic.
How to Set It Up (Step by Step)
The exact steps vary slightly between DAWs, but the principle is the same everywhere.
Step 1: Put a compressor plugin on the track you want to duck (typically your bass, pad, or synth track).
Step 2: Enable the sidechain input on the compressor. In Cubase, click the sidechain button (the small arrow icon) on the compressor and select your kick drum track as the source. In Ableton, unfold the compressor and select the kick track from the "Sidechain" dropdown. In FL Studio, right-click the bass mixer track and route the kick to it as a sidechain source. In Logic, click the sidechain dropdown at the top of the compressor and select the kick channel.
Step 3: Set your compressor controls. Start with a ratio of 4:1 to 6:1 (moderate to strong compression). Set the threshold low enough that the compressor activates on every kick hit — you should see the gain reduction meter moving in time with the kick. Set a fast attack (0–5ms) so the ducking happens immediately when the kick hits. The release is the most important control — it determines how quickly the bass comes back up after each kick. Start around 100–200ms and adjust by ear until the pumping feels musical and in time with your track.
Step 4: Adjust the amount. The gain reduction should typically be around 3–6dB for subtle, mix-cleaning sidechain, or 10–15dB+ for obvious, audible pumping (as used in EDM and trance). Listen to the result in context with the full mix — the kick should punch through clearly without the bass disappearing.
The Release Is Everything: Too fast and the bass snaps back up before the kick has finished, causing a clicking sound. Too slow and the bass stays ducked too long, creating gaps in the low end. The sweet spot is where the bass returns smoothly just before the next kick hits. This is a feel thing — trust your ears and adjust until it grooves.
When to Use Sidechain Compression
Kick vs Bass — Essential. This is the classic use case and arguably the most important mixing technique in electronic music. Almost every professional electronic track uses sidechain compression between the kick and bass. It's also incredibly useful in pop, hip-hop, rock, and any genre where the kick and bass need to coexist cleanly.
Kick vs Pads — Very useful. Pads and sustained chords can mask the kick's impact, especially in the low-mid frequencies. Gentle sidechain compression on your pads (triggered by the kick) creates a subtle breathing effect that gives the kick room to punch through without affecting the pad's overall character.
Kick vs Everything (mix bus sidechain) — Genre-dependent. In EDM, trance, and some pop, producers apply sidechain compression to the entire mix bus (minus the kick), creating that unmistakable "pumping" effect where the whole mix breathes in time with the kick. This is a creative effect, not just a mixing technique — it defines the sound of entire genres.
Vocal vs Instruments — Subtle but effective. Light sidechain compression on instrumental elements triggered by the vocal helps the vocal sit on top of the mix. Every time the singer starts a phrase, the instruments duck slightly. The ducking should be barely noticeable (1–3dB) — enough to create space without an audible pumping effect.
Creative pumping effects — Any element. You can sidechain anything to anything for creative results. Sidechain a reverb tail to the dry signal so the reverb swells up between notes. Sidechain a noise layer to a hi-hat for rhythmic texture. The technique is a creative tool, not just a technical fix.
Ghost Kick Sidechaining
Here's a pro technique: instead of sidechaining from your actual kick drum, create a silent "ghost" kick track. Copy your kick pattern to a new track, mute the track's output (so you can't hear it), and use this ghost track as the sidechain source for your bass and pads.
Why? Because your actual kick pattern might have fills, variations, or stops — and you want the sidechain pumping to remain consistent regardless of what your audible kick is doing. The ghost kick plays a steady four-on-the-floor pattern continuously, giving you a perfectly consistent sidechain effect even when your real kick takes a break.
This is standard practice in professional trance, house, and techno production.
Volume Shaping as an Alternative
Some producers prefer using volume shaping plugins (like LFOTool, VolumeShaper, or Kickstart) instead of traditional sidechain compression. These plugins draw a volume curve that repeats in time with your tempo, creating the same ducking effect without needing a sidechain source.
The advantage: more precise control over the shape of the duck (you can draw exactly how fast it drops and how it recovers). The disadvantage: it's not reactive to the actual kick — it's a fixed pattern that plays regardless. For most electronic music, volume shapers work brilliantly. For genres with variable kick patterns, traditional sidechain compression is more flexible.
Common Mistakes
Too much ducking. If the bass completely disappears every time the kick hits, you've gone too far. The bass should dip, not vanish. Reduce the ratio or raise the threshold.
Too slow an attack. If the attack isn't fast enough, the beginning of the kick is masked by the bass before the compressor kicks in. Use 0–5ms attack for sidechain compression.
Wrong release time. This is the most common mistake. If the release doesn't match your tempo, the pumping will feel off-beat or unmusical. Take the time to dial this in by ear.
Using it on everything. Sidechain compression is powerful but not universal. Not every element needs to be sidechained to the kick. Use it where there's a genuine frequency conflict or where you want a creative pumping effect. Overuse makes the mix sound weak and wobbly.
🎛️ See Sidechain Compression in Action
Our production courses demonstrate sidechain compression in context — as part of building a real track. You'll see exactly when, why, and how to set it up for different genres. Our Cubase Mixing Tutorial covers it in detail alongside every other mixing technique.
All the best — the Born To Produce Team ✌️
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