Sources

A source is a sound that makes signal without taking any input. They live in Sigil.Sound.Sounds (using static Sigil.Sound.Sounds; in a project; the REPL has them in scope already).

Source	Makes
Sine(frequency)	A pure tone. Also a smooth LFO below 20 Hz.
Saw(frequency)	A bright sawtooth, band-limited so it stays clean at high pitches.
Square(frequency, width)	A pulse wave. width is the duty cycle, 0.5 is a square.
Triangle(frequency, skew)	A softer wave between sine and saw. skew moves the peak.
Noise(seed)	White noise. The same seed gives the same noise every time.
Constant(value)	A flat level. Useful as a building block, rarely as a sound.
Fn(t => ...)	Any function of time in seconds, evaluated per sample.
Sample(buffer)	A recorded sound. See Samples.

Silence is also available as the empty sound.

Every frequency takes a number, another sound, or a function of time. The rest of the frequency handling is in Parameters.

Oscillators

// A 220 Hz sine, turned down so it sits comfortably under a mix.
Sine(220) * 0.5

// A pulse wave with a 30% duty cycle: thinner and more nasal than a square.
Square(110, 0.3) * 0.4

// A triangle wave, softened by a gentle low-pass.
Triangle(165, 0.5).LowPass(2000) * 0.5

Noise and constants

// Filtered noise, quiet: the shape of a breath or a hi-hat tail.
Noise(seed: 7).HighPass(4000) * 0.2

// A flat level of a quarter of full scale. Any sound can be offset by a constant.
Constant(0.25)

Your own function of time

Fn takes t, the time in seconds from the start of the render, and returns the value for that instant.

// A tone built directly from the formula: a 330 Hz sine at 40% level.
Fn(t => Math.Sin(2 * Math.PI * 330 * t)) * 0.4

Samples

// A sample from the REPL's built-in library, played at its recorded pitch.
Sample(Samples.Load("pluck.wav"))

See Samples for playback speed, loop modes and sample files.