Acid 303 squelch pattern 128 bpm 4 bars key F#

About this sample

This arpeggio features a classic acid house style pattern at 128 BPM in F# minor. It uses a single sawtooth oscillator per note, shaped by a resonant low-pass filter whose cutoff sweeps dynamically from about 150 Hz to 3500-5000 Hz depending on accents, creating the signature squelch effect. Resonance is enhanced by a narrow bandpass boost around 800 Hz, adding a pronounced peak. Each note has a short plucky envelope with quick attack and decay, and slides introduce smooth portamento between notes. Heavy tanh distortion adds grit, and a subtle stereo pan moves slowly through the 4-bar, 7.5-second sequence.

This pattern suits acid house, techno, and other electronic dance genres at around 128 BPM. It can be layered with drums and bass for a full groove, or processed with additional effects to emphasize the squelch or widen stereo image. Watch for resonance peaks in a mix, as they can dominate; careful EQing might be needed to balance the characteristic acidic harmonics.