Grime basslines use pulse waves through low-pass filter envelopes to produce a round, punchy sub sound

Unlike the warbling wobbly bass of speed garage, grime basslines are characteristically restrained and ‘round’. The standard synthesis approach: route a pulse wave (or narrow square wave) through a low-pass filter tied to an amplitude/filter envelope. Adjusting decay time and envelope amount produces a range of tones from tight punchy hits to longer notes. Increasing attack time creates a reverse-bass effect (the sound swells rather than punches), referencing an old-school UKG technique. This is a foundational synthesis recipe: pulse+LP filter+envelope = controllable bass character.

Examples

Lethal Bizzle / More Fire Crew as the canonical grime round-bass example. Double 99’s ‘RIP Groove’ for the reverse bass (long attack time). Tip 10: ‘By sending pulse waves through a low-pass filter tied to an envelope, you can create the sort of round bass employed by Lethal Bizzle’s chums More Fire Crew.‘

Assessment

In a synthesiser, create a pulse wave routed through a low-pass filter with an envelope. Set attack to near-zero, experiment with decay 50ms-500ms. Then increase attack to 200ms and describe how the bass character changes. Identify which settings approximate a grime round bass vs a reverse bass.