MUSI10223 Chap.7 Synthesis for Performance
Synthesis for Performance
This chapter builds sounds from the modules of a subtractive synthesiser. Oscillators generate repeating waveforms, and waveform choice establishes the starting timbre. Pitch follows oscillator frequency, while amplitude is shaped over time by an attack, decay, sustain and release envelope. A resonant filter removes selected frequency regions, with cutoff locating the boundary and resonance emphasising energy around it.
Modulation then turns static settings into movement: a low-frequency oscillator can create vibrato, tremolo or a repeating filter sweep, while an envelope can control amplitude, cutoff or another modulator. Multiple oscillators, detuning and cross-modulation introduce richer or dissonant spectra; filtered noise can become wind-like material.
Assessment-ready synthesis is demonstrated through a reproducible patch and an audible explanation. Students should be able to identify which module generated, shaped or moved each part of a sound, then adjust one parameter to match a reference or serve a performance action.
What this chapter covers
- 01
Electronic sound as performance material
- 02
Oscillators and waveform choice
- 03
Pitch and tuning
- 04
Amplitude and the signal path
- 05
Shape time with an envelope
- 06
Filter the spectrum
- 07
Resonance and character
- 08
Modulation creates motion
- 09
Cross-modulation and dissonance
- 10
Effects and spatial depth
- 11
Design a playable performance patch
- 12
Integrate synthesis for performance in rehearsal
- 13
Communicate synthesis for performance as a design case
Build a rising synthetic warning sound
- 1Choose an oscillator waveform for the core timbre, then set the amplitude envelope with a non-instant attack so the sound begins quietly and grows.
- 1Map a rising ramp from a low-frequency oscillator or modulation envelope to oscillator pitch so the note climbs through time.
- 1Open a low-pass filter during the rise and use moderate resonance so increasing upper-frequency energy makes the warning brighter and more focused.
- 1Set a short release in the amplitude envelope, trigger the patch, record it and confirm that pitch, brightness and loudness move in the intended order.
Key terms
- Subtractive synthesis
- Sound creation that begins with harmonically rich material and shapes it by filtering or attenuating selected frequencies.
- Oscillator
- A repeating waveform generator that supplies pitched or control signals inside a synthesiser.
- Waveform
- The repeating shape, such as sine, triangle, square or saw, that establishes an oscillator's harmonic character.
- ADSR envelope
- A time-shaping control with attack, decay, sustain and release stages.
- Filter cutoff
- The frequency boundary around which a filter begins to attenuate selected parts of the spectrum.
- Resonance
- Emphasis around a filter's cutoff frequency that makes the boundary and its movement more audible.
- LFO
- A low-frequency oscillator used as a repeating control signal for pitch, amplitude, cutoff or another parameter.
- Vibrato
- Periodic pitch movement created by modulating oscillator tuning.
- Tremolo
- Periodic loudness movement created by modulating amplitude.
- Cross-modulation
- Interaction in which one oscillator changes another oscillator's phase or tone, producing a more complex spectrum.
Synthesis for Performance FAQ
How do I use resonance and character in a performance design?
Resonance emphasises energy near the cutoff and can make filter movement more audible and characterful. Effects such as delay, distortion and reverb extend a patch into space, repetition and altered texture. For resonance and character, make one controlled comparison and write down the audible difference, the intended audience inference and the exact operation a collaborator should rehearse.
How do I use modulation creates motion in a performance design?
Modulation uses one changing signal to control another parameter, producing movement that can be periodic or evolving. Synthesis constructs sound by controlling generators and transformations rather than beginning with a field recording. For modulation creates motion, make one controlled comparison and write down the audible difference, the intended audience inference and the exact operation a collaborator should rehearse.
How do I use cross-modulation and dissonance in a performance design?
Cross-modulation connects oscillators and can create complex or dissonant spectra from simple sources. An oscillator supplies a repeating waveform whose shape strongly influences the starting timbre. For cross-modulation and dissonance, make one controlled comparison and write down the audible difference, the intended audience inference and the exact operation a collaborator should rehearse.
How do I use effects and spatial depth in a performance design?
Effects such as delay, distortion and reverb extend a patch into space, repetition and altered texture. Pitch follows oscillator frequency and can be controlled from a keyboard, sequencer or other MIDI source. For effects and spatial depth, make one controlled comparison and write down the audible difference, the intended audience inference and the exact operation a collaborator should rehearse.
Assessment move
Learn synthesis by rebuilding three sounds from an initialised patch. First make a plucked tone using one oscillator and a fast attack, short decay and low sustain. Second make wind from the noise generator, a shaped amplitude envelope and a slowly moving filter. Third make a rising warning using pitch modulation and an opening resonant filter.
Save each patch and annotate the signal path from generator to amplitude stage, filter, modulation and effects. For every control you move, write a prediction before listening: higher cutoff should add upper frequencies; longer release should extend the tail; faster LFO frequency should accelerate the repeated motion. If the result differs, isolate the routed parameter and try again.
Then take screenshots of the three patches and challenge yourself to identify which module explains each audible feature without touching the interface. Finish by changing exactly one parameter in each patch and recording the A/B pair. Those comparisons are stronger study evidence than memorised definitions because they prove you can hear and control the function of each module.
