This 4-bar loop at 140 BPM features a classic dubstep wobble bass built from two detuned oscillators: a sawtooth wave panned left and a 25% duty cycle square wave panned right, both keyed to F1 (43.65 Hz). A clean sine wave sub-bass underpins the low end for weight and clarity. The signature wobble effect is created by a time-varying 4-pole Butterworth low-pass filter modulated by an LFO whose rate changes rhythmically from slow half-note pulses up to rapid 1/16 triplets, sweeping the cutoff between 150 Hz and 4500 Hz. Heavy tanh distortion adds grit and harmonic complexity, while careful gain staging and stereo placement maintain balance and punch.
This loop suits dubstep and bass-heavy electronic genres at 140 BPM, fitting well in energetic, syncopated sections. It can be layered with drums and atmospheric elements, with care taken to carve space in the midrange to avoid muddiness from the saturated wobble. Additional sub-bass reinforcement or compression can help it sit firmly in a mix without overpowering other elements.