On top of the pad comes the first of the two 1/8th note sequences, this one playing the bass note of each chord for two bars each.
We’re using Logic’s ES1 which is a dual-oscillator synth which lets you balance between the first, ‘main’ oscillator and a sub oscillator, detuned an octave below. Oscillator one’s waveform is a triangle, with a pulse waveform for the sub, with the balance set 80/20 in Oscillator one’s favour. Cutoff is set very low to remove most of the brightness from the sound.
Once the part has been played in, its velocities are normalised to create its heavily ‘sequenced’ nature. We’re then using EQ to scoop low frequencies out using a filter below 126Hz and lastly, SoundToys’ Decapitator creates some warm saturation and drive.