Minimal Bass Loop

How it's made

Source

a monophonic analog-style bass voice. A triangle and a slightly detuned band-limited saw give the harmonic body, a sine at the fundamental adds the sub weight that small speakers still reproduce.

Body

a resonant low-pass (Q 1.3) whose cutoff starts at 0.3–2 kHz on the note onset and closes to 100–350 Hz within about 0.3 s, the filter-envelope "pluck" that makes a bass sound round; light tanh drive adds odd harmonics, then a 30 Hz high-pass removes DC and rumble.

Envelope

4 ms attack (no click), a short decay to a 0.7 sustain, release 80 ms; the gate follows the note length in the pattern, so notes breathe between the sparse hits.

Rhythm

A-minor phrases of two 4/4 bars (roots, a whole tone below, the fifth below) on an eighth-note grid. The loop holds whole bars at 90, 120 or 150 BPM (3, 4 or 5 bars in 8 s), so it repeats without a seam.

Variation

`rng` jitters note timing by about 3 ms, level by 10 % and tuning by a few cents; presets change pattern density, gate length, filter movement and tempo.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.