Methods of Sound Creation
Five Methods of Sound Creation
Once you know what types of sound are needed for a production, you need to understand how those sounds are made. There are five main methods of sound creation, ranging from entirely physical techniques to fully digital processes. A professional sound designer will use a combination of all five to build a complete soundtrack.
Method 1: Physical Props
Physical props are real objects used to create sounds. This method is at the heart of Foley work. The process involves two stages: creation of props (finding or building suitable objects) and capture and editing of audio (recording the sounds and processing them to fit the production).
For example, to create the sound of walking on snow, a Foley artist might squeeze a bag of cornflour. To simulate breaking bones, they might snap celery sticks. The sound is recorded using a close-placement microphone, then edited — trimmed, EQ’d, and time-aligned to the visual.
The five methods of sound creation are: physical props (creation of props, capture and editing of audio), environmental sounds (capture in different environments, selection and editing), sound synthesis (creation of patches, waveform selection, filters, modifiers), digital sample manipulation (import of audio, mapping, looping), and effects libraries (commercial, online, DAW loops).
Method 2: Environmental Sounds
Environmental sounds are recorded on location rather than in a studio. The process involves capture in different environments — such as a forest, a busy street, or an empty church — and then selection and editing of the best recordings. A sound recordist uses a portable recorder and specialised microphones to capture the natural soundscape of a location.
These recordings are used primarily for ambience tracks. After recording, the sound designer listens through hours of material, selects the most useful sections, removes unwanted noise, and edits the clips to loop seamlessly in the final production.
Method 3: Sound Synthesis
Sound synthesis creates sounds entirely from electronic signals. It is used when a sound designer needs a tone, texture, or effect that does not exist in the real world. The process begins with creation of patches — a patch is a saved set of synthesiser settings that produces a particular sound.
Waveform selection is the starting point. Common waveforms include sine (smooth, pure tone), sawtooth (bright, buzzy), square (hollow, reed-like), and triangle (soft, flute-like). Each waveform has a different timbre.
Filters shape the sound by removing certain frequencies. A low-pass filter removes high frequencies, making the sound warmer. A high-pass filter removes low frequencies, making the sound thinner. Adjusting the filter cutoff changes how bright or dark the sound appears.
Modifiers add movement and expression. An LFO (Low Frequency Oscillator) creates slow, repeating changes — for example, a gentle wobble in pitch (vibrato) or volume (tremolo). An envelope controls how a sound changes over time using four stages: Attack (how quickly the sound reaches full volume), Decay (how quickly it drops to the sustain level), Sustain (the level held while a key is pressed), and Release (how quickly the sound fades after the key is released). Together these form the ADSR envelope.
Method 4: Digital Sample Manipulation
Digital sample manipulation starts with a real recording (a sample) and transforms it into something new. The process involves creation of patches (building a playable instrument from samples), import of audio (loading recordings into a sampler), mapping (assigning different samples to different keys on a keyboard so that pitch, velocity, or zone varies), and looping (setting a section of audio to repeat seamlessly so a short sample can sustain indefinitely).
For example, a sound designer might record a single violin note, import it into a sampler, map it across the keyboard at different pitches, add a loop point so it sustains, and then apply filters and effects. The result is a playable virtual violin built from a single real recording.
Method 5: Effects Libraries
An effects library is a collection of pre-recorded sounds organised by category — footsteps, weather, vehicles, animals, impacts, and so on. There are three main sources:
- Commercial libraries — professionally recorded collections sold by specialist companies. These offer high-quality, royalty-free sounds.
- Online libraries — free or subscription-based websites offering downloadable effects. Quality varies, and licensing terms must be checked.
- DAW loops — built-in sound libraries that come with Digital Audio Workstations like Logic Pro, Ableton Live, or GarageBand. These include both effects and musical loops.
The ADSR envelope controls how a synthesised or sampled sound changes over time. Attack = time to reach full volume. Decay = time to drop to the sustain level. Sustain = the volume held while the key is pressed. Release = time for the sound to fade after the key is released. Changing these values dramatically alters the character of the sound.
The method a sound designer chooses depends on the production’s needs, budget, and deadlines. Physical props and environmental recording give the most realistic results but take the most time. Sound synthesis is ideal for sci-fi, electronic, or abstract sounds that don’t exist in the real world. Digital sample manipulation offers a middle ground — starting from a real recording but shaping it into something new. Effects libraries are the fastest option but offer less originality. Most productions use a combination of all five methods.