awesome synth work idk how you got that buzzy opening sound im assuming using a filter cutoff or just making two separate synths however you did it sounds freakin nasty🔥
It's a saw shape osc (3 unison voices with medium detune) through a low pass filter with high resonance (in Serum MG 6 Low with cca. 50% res) and big slow envelope. Then you play low notes.
