Oscillator waveforms

▸What it is

An oscillator is the source of the sound. Before any envelope, filter, or effect, something has to vibrate, and the waveform decides what that vibration looks like — and therefore what it sounds like. Sine is a single pure tone, no overtones; mellow, almost invisible in a mix. Triangle is sine's slightly brighter sibling — a hollow, woody quality. Saw is the rough one: every overtone from the fundamental upward, ragged and bright, the raw material for most bass and lead sounds. Square has only odd harmonics — that hollow, clarinet-like body. Pulse is a square with adjustable width, where shifting the width hollows or thickens the tone. Noise has no pitch at all, just hash — useful for breath, snares, and adding air to a held note. Pick the waveform first; everything downstream is shaping that source.

▸Questions

• Should I use sine, saw, or square for a bass?

  Saw and square are the workhorses. Saw for anything that needs grit, square for hollow and punchy. Sub-bass under everything else is usually sine or triangle, layered with a brighter shape on top.

• What does pulse width actually change?

  It tilts the symmetry of the wave. A 50% pulse is a square; pushing the width toward 10% or 90% makes the tone progressively more nasal and reedy.

• Why does my saw wave sound thin?

  A single saw is naturally bright but narrow. Detuning two saws against each other — the multi-osc concept — is what makes it feel wide and thick.

▸In the curriculum

First taught

BS1 · Pick a wave — A/B sine, saw, and square over the bed. Part of the Bass track.

Reused in

The same concept comes back in 3 lessons later in the curriculum, in a new context.

▸Related concepts

Concepts that share a lesson with oscillator waveforms: