Sidechain Compression: 5 Pro Techniques

By Marcus Chen · October 4, 2026

What Is Sidechain Compression?

Sidechain compression uses one audio signal to trigger compression on another. The most famous example is the kick drum ducking the bass, but there are many creative and corrective uses beyond that.

Technique 1: Kick and Bass Ducking

Route your kick to the sidechain input of a compressor on the bass track. Settings: fast attack (1-5ms), medium release (100-200ms), ratio 4:1, threshold set so you get 3-6dB of gain reduction on each kick hit. This creates space without cutting bass frequencies.

Technique 2: Vocal Clarity on Mix Bus

Send the lead vocal to a compressor on the mix bus or instrumental group. When the vocal plays, the instruments dip by 1-2dB, making the vocal sit forward without turning it up. Use a gentle ratio (2:1) and slow attack (30ms) for transparency.

Technique 3: De-essing via Sidechain

Send the vocal through a harsh EQ boost at 5-8kHz into the sidechain input of a compressor on the same vocal. The compressor only reacts to sibilance, providing surgical de-essing without affecting the rest of the vocal tone.

Technique 4: Reverb Ducking

Sidechain the reverb return to the dry vocal. When the singer is active, the reverb ducks down. When they pause, the reverb swells up naturally. This keeps the vocal intimate while still having a lush tail between phrases.

Technique 5: Multiband Sidechain

Use a multiband compressor with sidechain input to duck only the conflicting frequency range. For example, duck only 80-250Hz on guitars when the kick plays, leaving the guitar presence intact.