Acid techno 303 bassline loop, 138 bpm, 2 bars

About this sample

This acid techno bassline loop features a resonant sawtooth oscillator with per-note filter envelopes modulating the cutoff between about 130 Hz and over 3400 Hz on accented notes, creating a classic squelchy acid sound. The pattern includes slides that smoothly pitch bend notes over two octaves, while amplitude envelopes shape each note with quick attacks and moderate sustain. Saturation adds analog-style grit, and the signal is mono, high-passed at 28 Hz to remove sub rumble, then low-passed at 5200 Hz. A subtle sidechain effect synced to 138 BPM at quarter-note intervals adds rhythmic pumping to the two-bar, 3.48-second loop.

This bassline fits well in acid techno and related genres at 138 BPM, providing a driving, dynamic groove. It can be layered with drum machines or synth leads, and its mono, filtered tone leaves space in the mix for other elements. Watch for frequency clashes around the midrange cutoff and manage the saturation level to keep the grit controlled without overwhelming the mix.