Resonant 303 acid bassline 125bpm 4 bars

About this sample

This bassline features a classic sawtooth oscillator tuned across notes from C2 to C3 in a 16-step, 125 BPM acid pattern spanning 4 bars. Smooth slides interpolate frequencies over 60 ms between notes, while a 4-pole low-pass Butterworth filter with a base cutoff around 250 Hz is modulated by a fast-decaying envelope, reaching up to 4500 Hz on accented notes for that signature squelchy acid tone. The sound is shaped with heavy tanh saturation for a biting, vintage character, and accented notes are louder with increased filter modulation depth. The output is normalized to -3 dB with gentle fades to avoid clicks.

This bassline suits techno, acid house, and other dance genres around 125 BPM. It works well as a driving low-end element or for layering with more percussive sounds. Be mindful of its strong midrange and resonance to avoid masking other elements; adding subtle compression or EQ can help it sit tightly in a mix.