What is Sidechain Compression?
Sidechain compression is a dynamic processing technique where a compressor's gain reduction is triggered by a separate audio signal — called the key or sidechain source — rather than the signal running through it.
Why Does Sidechain Compression Make Your Mix Pump?
The pump effect is perceptual. When two sounds compete for the same low-frequency space, the human ear cannot cleanly separate them. Sidechain compression solves this by creating time in the mix.
Sidechain vs Ducking — What's the Difference?
Ducking is a broad term for any automatic volume reduction of one signal caused by another. Sidechain compression is a specific type of ducking that uses a compressor's full circuit.
How to Sidechain in FL Studio
FL Studio's Fruity Limiter is the easiest route: load it on your bass/synth, navigate to the Sidechain tab, enable it, set the Key source to your kick/808 track, then adjust Attack, Release, and Ratio.
How to Sidechain in Ableton Live
Ableton has the most intuitive native sidechain system: route your kick to a bus, insert Compressor on your target track, click the Sidechain button, set the External Source to the kick drum bus.
How to Sidechain in Logic Pro
Logic Pro uses a send-based sidechain system: create an aux channel with Compressor, route your kick to the same bus as a pre-fader send, then enable Sidechain on the compressor and select the kick bus.
Creative Uses Beyond the Pump
Sidechain compression is not only for kick-ducking-bass. Use it on reverb sends keyed to the kick for natural build-ups, on pads ducked against vocals for presence, or on full mix buses for groove energy.
Common Sidechain Mistakes
Too fast an attack kills transients. Wrong release timing creates artefacts or flattens the groove. Aggressive sidechain on bass tracks can strip sub-bass content entirely.
Sidechain Settings by Genre
| Groove Style | Attack | Release | Ratio | Result |
|---|---|---|---|---|
| EDM / Big room | 0.1–1 ms | 80–120 ms | 4:1–6:1 | Hard, pumping sync |
| House / Deep | 1–5 ms | 150–250 ms | 3:1–4:1 | Smooth, breathing |
| Hip-hop / Trap | 5–15 ms | 100–180 ms | 4:1–8:1 | Snappy with transient bleed |
Sidechain Setup Steps
- Step 1: Load Your Compressor on the Track You Want to Duck
Place your compressor on the track that is muddying the low end — typically a bass, synth pad, or full mix bus. The kick is the trigger, not the target. - Step 2: Set the Sidechain Source to Your Kick or 808 Track
Engage the sidechain input and select your kick or 808 track as the external trigger. Ensure the kick signal is clean — any bleed will cause unpredictable compressor behaviour. - Step 3: Adjust Threshold, Ratio, Attack, and Release
Set threshold so gain reduction engages on every kick hit (2–6 dB). Ratio 4:1 is the starting point. Fast attack (0.1–10 ms). Release 50–400 ms depending on tempo and feel. - Step 4: Blend the Compressed Signal Back In
If using a parallel routing, use the wet/dry or send level to blend compressed and dry signals. 30–70% wet typically gives a natural result. - Step 5: Fine-Tune Attack and Release for Groove Feel
Adjust attack for transient handling (fast = clean kick, slower = character bleed) and release for rhythmic smoothness (short = pulsing EDM, longer = breathing house).
Find the right compressor for your sidechain setup — browse thousands of VST plugins on Plugg Supply.
Browse Free DownloadsFrequently Asked Questions
- What is sidechain compression in simple terms?
- Sidechain compression is a technique where a compressor reduces the volume of one track (like a bass or synth) every time another track (like a kick drum) hits, creating a rhythmic pumping effect.
- Does sidechain compression ruin your mix?
- No — when used correctly, sidechain compression improves clarity and groove. Problems only arise when settings are too aggressive or release timing is wrong.
- Can you sidechain without a compressor?
- Yes. A simple gain-based ducking tool performs the same basic function but without the ratio, attack, and release controls. A proper sidechain compressor always sounds more musical.
- What ratio should I use for sidechain compression?
- Start with 4:1. This provides noticeable gain reduction without sounding harsh. More aggressive ratios (6:1–12:1) create a harder pump typical of EDM.
- Should I high-pass the sidechain input?
- Yes. Most engineers apply a 100–200 Hz high-pass filter to the sidechain input so the compressor reacts to the kick's attack rather than its sub-bass energy.
- How do I sidechain multiple tracks to one kick?
- Insert a single compressor on a submix bus and route each track you want to duck to that bus's sidechain input. In Ableton, use an Audio Effect Rack with one compressor sidechained to the kick.
- Is sidechain compression only for EDM?
- No. Sidechain compression is widely used in pop, hip-hop, rock, and acoustic music to create space between a vocal and the rhythm section, or to add subtle rhythmic movement.
- What is the difference between parallel and serial sidechain compression?
- Serial (traditional) sidechain places the compressor directly in the signal path. Parallel sidechain splits the signal to a dry path and a compressed path, blending them. Parallel preserves more of the original dynamics.