This 3.38-second acid synth loop features a raw sawtooth oscillator running at 142 BPM across 2 bars with a 16th note pattern. The signature 303 squelch is created by a resonant 4-pole low-pass filter with cutoff modulated by an envelope that opens wider and decays faster on accented notes. Pitch slides glide smoothly between notes using exponential interpolation, and a tanh-based distortion adds grit and harmonics. The sound is stereo widened by a subtle 0.5 ms delay on the right channel, with a high-pass filter cleaning out low-end mud.
It fits well in acid house, techno, and other electronic genres around 140 BPM, providing energetic melodic movement. Layer it with deep bass or percussive elements but avoid cluttering the midrange where the squelch lives. Gentle compression and EQ can help the loop sit tighter in a mix without losing its dynamic filter modulation and characteristic bite.