Hardware or software device generating audio signals or MIDI events step-by-step — time-based parameter control and sound automation. Essential for Foley sequencing and music tracking.
On set or in post-production, you need control over sound events that can be repeated or precisely timed — that's exactly where the sequencer comes in. The device (or software) generates audio signals or MIDI commands in strict temporal sequence. You program steps, set tempo and gate length, and the sequencer plays the sequence over and over again — or triggers other devices like synthesizers, drum modules, or samplers according to your pattern.
In film music and sound design, we primarily use sequencers for two tasks: Firstly, to precisely construct repetitive elements — a mechanical metronome tick, the pulsing of a generator, rhythmic drones for horror or sci-fi. Secondly, to refine MIDI data: You sequence note-on/off events, velocity curves, controller movements (like filter frequency or reverb send), and obtain time-synchronous automation that you can later adjust in your DAW. This saves you manual recording and guarantees precision.
Practical on Set: If you want a clock tick as a sound design element, or a regular electronic hum for a machine scene, you run a sequencer in real-time or pre-record the loop. In Editing and Mixing, the sequencer is often used as a VST plugin — many DAWs now have integrated step sequencers or support external hardware via MIDI. The advantages: quantized accuracy, automatic repetition without timing drift, easy variation through parameter morphing.
The device differs from classic synthesizers in that it's less about timbre and more about timing precision and programming. Sequencers with analog circuitry offer tactile directness (setting each step via a knob), while digital sequencers (software) allow for faster editing and full integration into the DAW workflow. For sound design for robots, machines, or repetitive atmospheric drones, the sequencer is indispensable — it guarantees the nervous, exact mechanical quality that you can't achieve with manual automation.