A gate or volume LFO triggered to tempo can create rhythmic gain pumping in sync with the groove

By triggering a gate or a tempo-synced volume automation curve from the song’s metric grid, an engineer can create rhythmic gain modulation that emphasizes or de-emphasizes certain beat positions without affecting the signal’s tone. A common technique in dance music is to trigger a gate from the kick drum or from a MIDI click at tempo, so that reverb tails and pad textures ‘pump’ in sync with the groove. This creates energetic rhythmic breathing. The same principle applies to multing: splitting a rhythm guitar part so alternate notes can be balanced independently adds groove without compression artifacts.

Examples

Side-chain gate on a reverb bus triggered from the kick drum: the reverb ducks on the kick downbeat and opens up on off-beats, creating the pumping effect.

Assessment

Describe the difference between compressor-based pumping and gate/tempo-triggered gain modulation. Give one practical application for each in a mix.