A synthesized snare combines a tuned membrane tone with a decaying noise component
A snare drum’s character comes from two distinct sound sources: the tonal body of the head/shell (a pitched membrane) and the rattle of the snare wires (broadband noise). Synthesizing only the tuned oscillator yields a thin tom-like tone that is ‘not really a snare’ — the noise is what makes it read as a snare. The patch therefore layers a fixed-frequency membrane oscillator (e.g., 140 Hz) with a noise source that has its own decaying envelope. The noise can be injected two ways: as an FM modulator of the membrane oscillator, or as a parallel white-noise layer added alongside it. Both give the noise its own decay so the sizzle can be tuned independently of the body.
Examples
Operator snare: oscillator A = fixed 140 Hz sine (membrane) with pitch + amp envelopes; add a noise waveform either modulating A or as a parallel oscillator with its own decay envelope for the wire rattle.
Assessment
Solo the tonal oscillator of a synthesized snare and describe why it fails to sound like a snare. Then add the noise layer and name which perceptual attribute the noise supplies.