🔗 Sidechain Processing

Master sidechain compression, ducking techniques, and creative pumping effects that define modern electronic music

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🔗 What Is Sidechain Processing

Sidechain processing uses the signal from one track to control the dynamics of another. The most common application is sidechain compression, where the kick drum's signal triggers compression on the bass or pad, creating space and rhythmic movement.

  • Key Signal (Trigger): The input that triggers the effect — typically a kick drum, snare, or ghost trigger
  • Target Signal: The track being affected — usually bass, pads, reverb tails, or full submixes
  • Ducking: The target momentarily reduces in volume when the key signal plays, then recovers
  • Pumping Effect: The rhythmic volume swell created by the duck-and-recover cycle, iconic in EDM and house music

⚙️ Basic Sidechain Setup

Routing the Sidechain

  • Insert a compressor on the target track (e.g., bass)
  • Set the compressor's sidechain input to your trigger track (e.g., kick)
  • The compressor now responds to the kick's level instead of the bass's own level
  • Adjust threshold until the compressor activates on each kick hit
👻 Ghost Trigger Technique: Instead of using the actual kick drum, create a muted "ghost" MIDI track with a short click. This gives you independent control over sidechain timing without being locked to your kick pattern — especially useful during breakdowns where the kick drops out but you still want the pumping effect.

🎛️ Sidechain Compression Settings

🔧 Subtle Ducking (Mixing Clarity):
  • Ratio: 2:1 to 4:1
  • Attack: 0.1–1 ms (fast, to catch the transient)
  • Release: 50–100 ms (quick recovery)
  • Gain Reduction: 2–4 dB
  • Use Case: Creating space for the kick without audible pumping
🔧 Pumping Effect (Creative/EDM):
  • Ratio: 8:1 to ∞:1 (limiting)
  • Attack: 0.01–0.5 ms (instant)
  • Release: 100–300 ms (shaped to the tempo)
  • Gain Reduction: 6–20 dB
  • Use Case: Classic EDM pump on pads, chords, or full mix bus
💡 Release Timing: Match your release to the tempo. At 128 BPM a quarter note is ~469 ms. Set release so the signal fully recovers just before the next kick hit. Too fast = choppy; too slow = the signal never fully recovers.

📊 Frequency-Specific Sidechain

Instead of ducking the entire signal, use multiband or EQ-filtered sidechain compression to only affect specific frequency ranges. This preserves more of the original sound while solving frequency conflicts.

Techniques

  • Multiband Sidechain: Use a multiband compressor and sidechain only the low band (below 200 Hz). The bass ducks in the sub range when the kick hits, but mids and highs remain untouched.
  • Sidechain EQ Filter: Many compressors have a sidechain EQ/filter. Set a high-pass filter on the sidechain input so only the kick's click (not its sub) triggers the compression.
  • Dynamic EQ: Use a dynamic EQ with external sidechain to cut specific frequencies only when the trigger plays. More surgical than broadband compression.

🎨 Creative Sidechain Uses

  • Reverb Ducking: Sidechain your reverb return from the dry vocal. Reverb reduces during vocal phrases and blooms in the gaps — clean vocals with lush ambience.
  • Pad Pumping: Classic EDM technique — sidechain sustained pads from the kick for rhythmic breathing movement.
  • Sidechain Gating: Use a gate with sidechain to open only when a specific element plays. Create rhythmic chopping effects on pads or textures.
  • Volume Shaping: Use dedicated plugins like LFOTool, VolumeShaper, or Kickstart for tempo-synced ducking without needing a trigger track.
  • Delay Ducking: Sidechain delays from the source signal so repeats only appear between notes — prevents delay buildup during busy passages.
💡 Pro Tip: Layer multiple sidechain targets at different depths. Light sidechain on the bass (3 dB), medium on pads (6 dB), heavy on reverb (10 dB). This creates a cohesive pumping groove where every element breathes together.
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