Sidechain Compression for Trance: 9 Techniques That Make the Kick Breathe

Your kick and bass are both in the mix, both at the right level, and the low end still sounds like two men fighting over a microphone. That’s a sidechain problem, and “slap LFOTool on the bass” is not the whole answer. In trance, the pump is half the emotion — the shape of the duck, where you route the trigger, and how it changes across the arrangement matter as much as the sounds themselves.

TL;DR

• Trigger everything from a dedicated ghost kick, not the real one — the pump stays coherent through fills and drops.
• For a pumping bass at 138 BPM, aim for 6–10 dB of gain reduction with the fastest attack and a release around 150 ms so the bass recovers on the offbeat.
• Volume shapers (LFOTool, Kickstart, VolumeShaper) give you a drawn curve; a real compressor gives you musical response. Use both, on different sources.
• Sidechain your reverb and delay returns separately from the dry signal. This is the single move that most obviously separates polished mixes from bedroom ones.
• Automate sidechain depth to zero through breakdowns and ramp it back up two bars before the drop.

Build a ghost kick before you touch a compressor

The biggest upgrade to your sidechain workflow isn’t a plugin — it’s a dedicated trigger track. Duplicate your kick to a new track, kill its output (route to “Sends Only” with no sends in Ableton, a muted mixer channel in FL, a bus with no output in Logic), and use that silent track as the sidechain source for every element that needs to duck.

Three reasons this matters:

1. The ghost stays a rock-steady four-on-the-floor even when the real kick drops out for a snare roll, a fill, or the final bar before a breakdown. Your bass keeps pumping in time when the track wants it to.
2. You can nudge the ghost 5–15 ms earlier than the audible kick. The bass starts ducking before the transient hits, so the two never collide on the same sample.
3. You can process the trigger independently — a high-pass around 200 Hz and a hard limiter give the compressor a consistent, punchy signal to react to, regardless of how the real kick is EQ’d or layered.

Every bass, pad, pluck, reverb return and delay send now references the same trigger. Instead of each element ducking to a slightly different source, the whole track breathes together. This one habit fixes 80% of the “why does my bass ducking sound weird on fills” problems before you’ve even opened a plugin.

The classic bass pump: fast attack, tempo-locked release

Under a 138 BPM kick, the duck needs to hit its low point on the kick and recover to unity right before the next one lands. Recover too early and you get a boxy “wah-wah”. Too late and the bass sounds strangled and small.

Starting point on any transparent compressor (Ableton Glue, Pro-C 2, Logic Compressor):

• Ratio: 4:1 to 8:1
• Attack: as fast as the plugin allows
• Release: start around 120–160 ms at 138 BPM, tune by ear
• Threshold: set for 6–10 dB gain reduction on the kick
• Knee: hard, so the duck is decisive

Release is where most people go wrong. A quarter note at 138 BPM is 435 ms; an eighth is 217 ms. You want the compressor most of the way back to unity roughly a sixteenth before the next kick, which usually lands the release somewhere in the 120–180 ms range. Push it toward 300 ms and the bass will still be recovering when the next kick fires — you’ll hear it swell into the downbeat.

Audition in solo-with-kick, not in the full mix. Loop two bars, close your eyes, and turn the release until the bass breathes back in on the offbeat like it’s answering the kick. Then unsolo and check the low end reads as one instrument.

Volume shaper vs compressor: they’re not the same tool

LFOTool, ShaperBox’s VolumeShaper, Kickstart and Duck aren’t really compressors — they’re tempo-synced envelope followers with a curve you draw by hand. That distinction matters, because it dictates when to reach for which.

A drawn curve is perfectly repeatable, has no threshold to babysit, works on quiet elements that would never trigger a real compressor, and shows you exactly what’s happening. Draw a hard drop on beat 1 with a smooth exponential return and every kick behaves identically for the rest of the track.

The downside: it isn’t reacting to anything. When the mix gets busier and elements start clashing, the curve doesn’t care. A real compressor ducks harder when the kick is louder and softer when it’s quieter — that’s musical behaviour, and you can’t draw it.

How I split them in practice:

• Volume shaper on synth basses, plucks and anything with a slow attack that a compressor would smear. Also on wide FX where I want a very specific rhythmic contour.
• Compressor sidechain on pads, reverb returns, delay returns, and master-bus glue — anywhere I want the ducking to breathe with the material.

Stacking is fine and often useful: a shallow shaper for the visible pump plus a compressor doing another 2–3 dB for the musical response. What you can’t do is stack two aggressive ones on the same source — the seams show immediately.

Pads: 3–5 dB is the difference between “wall” and “breath”

Trance pads live or die on how they interact with the kick. Too much sidechain and the pad flickers unnaturally, like a strobe. None at all and it fogs the low-mids and blurs the kick’s punch. Aim for the pad to breathe by 3–5 dB, not pump.

Chain on a pad, in order:

1. High-pass at 150–250 Hz. Pads have no business down there.
2. Compressor keyed from the ghost kick. Ratio 2:1, attack 5–10 ms, release 250–400 ms, threshold for 3–5 dB reduction.
3. Long-tail reverb after the compressor, so the tail doesn’t get chopped and stays glued to the pad.

The slower attack is deliberate. The pad has no meaningful transient to protect, and a slow attack makes the duck feel like the pad is leaning back for the kick rather than getting punched out of the way. A/B attack 10 ms against 0.1 ms on a pad — the slower one almost always sounds more musical.

If the pad has a stereo widener or chorus in the chain, put it before the compressor so the ducking acts on the final wide image. Otherwise the width can pulse subtly with the pump and sound off.

Sidechain the reverb and delay returns separately

This is the move that most obviously separates polished trance mixes from bedroom ones. Long reverb tails and dotted-eighth delays fill the space between kicks — which is exactly the space the kick’s punch is trying to occupy. Ducking the dry pluck alone isn’t enough; the wet tail is what’s actually masking things.

Run your reverb and delay as return/aux sends, not inserts. On each return, drop a compressor keyed to the ghost kick:

• Reverb return: 4–7 dB reduction, ratio 4:1, fastest attack, release 200–300 ms. The longer release lets the tail fade back in gradually — the room appears to “open up” between kicks.
• Delay return: 3–5 dB reduction, similar settings, release around 150 ms so individual taps stay articulate.

Now your dry plucks, vocals and leads can stay relatively untouched while the space around them ducks with the kick. Depth without mud. You can typically push reverb sends 3–4 dB louder than before because the tails are getting out of the kick’s way.

One caveat: if your delay is dotted or triplet, the ducking rhythm can fight the delay rhythm and sound weird. Shorten the release until the ducking gets out of the way, or swap the compressor for a subtler drawn curve.

Browse Trance packs at Myloops →

Master bus glue: the 1 dB rule

A whisper of sidechain on the master can tie the whole mix together, but this is where beginners overdo it and end up with a lifeless, over-pumped record. The rule is brutal: if you can hear the master compressor pumping on its own, it’s too much.

On the master, before the limiter:

1. Bus compressor (Ableton Glue, an SSL-style unit, Pro-C 2 in “Bus” mode) with the ghost kick as external sidechain.
2. Ratio 2:1, attack 10–30 ms, release “auto” or around 100 ms.
3. Threshold set for 1–2 dB of reduction on the kick. That’s it.

This is doing something completely different from the aggressive bass duck. You’re letting the master respond very slightly to the kick, which unifies the elements and creates a subtle overall pump across the track. Bypass and re-enable — it should sound tighter and more together, never obviously pumping. Your limiter (Pro-L 2, Ozone Maximizer, whatever) stays as the last thing in the chain, catching peaks after the glue has done its job.

Turn the duck into the groove: rolling bass swells

Sidechain doesn’t have to be a mix fix — you can weaponise it. On offbeat 1/8 or 1/16 rolling basses, deliberately overshoot the release so the bass swells up between kicks instead of just recovering.

Uplifting-style offbeat bass, 138 BPM:

• Ratio 6:1
• Attack: fastest
• Release 250–350 ms — roughly a quarter note
• Gain reduction 10–12 dB

Now the bass is effectively off during the kick and rising steadily toward the next one. That “wah” contour locks to the four-on-the-floor and drives the track forward — it’s a big part of why classic Anjuna-flavoured basslines feel so relentless. The pump is the groove.

Chase the compressor with a bit of saturation (Saturn 2, Decapitator, a tape emulation) and the swell picks up harmonics that make the bass feel bigger on laptop speakers without adding any low-end energy. Perfect for offbeats that need to translate.

Automate sidechain depth across the arrangement

A trance track isn’t one mix state — it’s an intro, breakdown, build and drop, and each section wants a different pump. Leaving sidechain static across all of them is the surest sign of a producer who set it up once and never came back.

My default moves:

• Intro: full sidechain depth on bass and pads. Establishes the groove.
• Breakdown: automate sidechain to 0% on pads and any sustained elements so they bloom fully. Automate LFOTool’s Depth, or the compressor’s wet/dry.
• Last 2 bars before the drop: ramp the pump back up to 100% so it’s already breathing when the kick returns.
• Drop: full pump, maybe 1–2 dB deeper than the intro for impact.
• Outro: ease the pump back down as elements drop out.

The breakdown move is the important one. Producers leave sidechain on through a breakdown and then wonder why the pads sound thin and vaguely rhythmic when there’s no kick to justify it. Kill the ducking and the pad becomes the full emotional statement it was written to be.

Sub and mid-bass want different treatment

If you split your bass into a sub layer (sine below ~120 Hz) and a mid layer (the character sound above), sidechain them differently. They’re doing different jobs.

The sub is fighting the kick’s fundamental head-on. It needs aggressive, tight ducking:

• Ratio 8:1 or higher
• Attack: fastest
• Release around 100 ms — get the sub back fast
• 10–14 dB gain reduction

The mid-bass is competing more with the kick’s click and body than its fundamental. Duck it as hard as the sub and the groove goes hollow:

• Ratio 3:1
• Attack 1–3 ms so the bass note’s own transient survives
• Release 150–200 ms
• 4–6 dB gain reduction

The low end gets out of the kick’s way completely while the character of the bass — growl, pluck, pick attack — stays present and drives the track. If you don’t want to run two layers, a multiband compressor like Pro-MB will get you close: aggressive sidechained band below 120 Hz, milder band above.

Browse Trance packs at Myloops →

Parallel sidechain: pump without losing weight

Worth knowing when 10 dB of duck guts the bass on a big system: duplicate the channel and pump only the copy.

1. Duplicate the bass. Call them “Bass Dry” and “Bass Pump”.
2. On Pump, go aggressive — 12–15 dB reduction, ratio 10:1, fastest attack, release 150 ms.
3. On Dry, no sidechain, or a token 2–3 dB duck to keep it out of the kick’s fundamental.
4. Blend to taste, usually around 70% Pump / 30% Dry.

The dry layer holds average energy up so the bass stays full on small speakers and survives the limiter. The pumped layer supplies the visible ducking that lets the kick punch through. On a club system this keeps consistent low-end weight instead of the bass vanishing under every kick. It’s especially useful in tech-trance and psytrance, where the bass is dense enough that dropping it 12 dB every downbeat would rip the guts out of the track.

Common problems and fast fixes

When something sounds off, it’s almost always one of these:

The bottom line

Sidechain in trance isn’t one technique — it’s a whole approach to how the kick relates to everything else. A ghost kick trigger, split treatment for sub and mid-bass, gentle ducking on pads, dedicated compressors on reverb and delay returns, and a hair of glue on the master will get you 90% of the way to a professional low end.

The remaining 10% is arrangement automation. Static sidechain across a whole track is the mark of a producer who set it up once and forgot; automating depth through intros, breakdowns and drops turns a mix fix into a musical tool, where the pump becomes part of the emotion rather than a technical necessity. Lock the ghost kick habit into your default template, and every new project starts from a better place than your last one ended.