Cinematic sound design
Rhythmic gate or sidechain compression for a cinematic pulse?
A tempo-synced rhythmic gate gives an audio source a repeating volume pattern. Sidechain compression turns it down in response to another signal, often a kick. Both can make a part move, but the choice depends on what should control the movement.
If the pad needs its own rhythm, start with a rhythmic gate. If it needs to make room whenever the kick hits, try sidechain compression.
Here, rhythmic gate means a repeating volume pattern. A conventional noise gate responds to signal level, and some gates can follow an external sidechain. The trigger matters more than the name.
When the pulse is part of the composition
Hold a chord and listen to it against the cue. The notes may already be right. What's missing is a pattern that gives the section some pace.
A rhythmic gate can shape that incoming audio into separate pulses. The source keeps supplying the tone while the effect controls how much gets through. You don't need to rewrite the chord as a fast MIDI part just to hear it repeat.
Start slowly enough to hear the gaps. Make each pulse shorter if the part feels too connected. Soften its entrance if the attacks pull attention away from dialogue or a melody. A deep gap can create a hard chop; a shallower change can leave the pad feeling continuous.
When another sound should make the space
With sidechain compression, another signal tells the compressor when to reduce the level. A kick can push a pad down at each hit, then let it recover between hits.
The result depends on the trigger as well as the compressor settings. Threshold and ratio affect how much it reacts. Attack and release affect how it moves into and out of that reduction. Change the kick pattern and the ducking pattern can change with it.
That connection is useful when the goal is room in the mix. It can also become a creative rhythm. A separate trigger track lets you design that rhythm without making the trigger itself audible in the final mix.
Where volume shaping fits
Some effects draw or sequence the volume curve directly. They can sound like pumping compression without using a compressor to create it. Others offer several ways to start or synchronize the curve.
That overlap is why the label on the plugin isn't enough. Check what controls the movement, how it follows the song, and whether you can shape the part without unnecessary routing.
What about tremolo and arpeggiators?
Tremolo also changes level over time. A smooth curve can make a held sound breathe, while a sharper curve can move toward rhythmic chopping. The line between a tremolo and a rhythmic gate can be thin once you start changing the shape.
An arpeggiator changes the notes being triggered. That's a different musical choice. Use one when you want the harmony broken into a note pattern, rather than the existing audio shaped into pulses.
Compare the same source at a similar level
Use one audio source for the comparison. Keep the performance and any source effects identical, then adjust the processed playback level so louder doesn't automatically sound better.
Listen in the cue as well as soloed. The pattern that sounds exciting on its own might fight the percussion. A smaller movement can work better once the rest of the arrangement enters.
Try the part before changing the chord
Pulse Maker reshapes incoming audio into rhythmic movement. You supply the sound; Pulse Maker supplies the movement.
Hear the effect on a real part.
Watch Pulse Maker in Ableton Live and compare the separate dry and processed audio recordings.
Further reading
For examples of signal routing and modulation, see the compressor, gate and Auto Pan-Tremolo sections of Ableton’s audio effect reference.