A Complex Screech in Serum

I start by creating an envelope. It goes to the matrix and then to the master tune, so I assign envelope 2 to global master tune. Set the amount on 19, because 19 is an octave in Serum. Then I assign the same envelope to the volume, to make sure no volume is playing after the screech is done.

Next I open a simple other waveform in oscillator B, reduce the volume and select FM from B. Add the envelope to that as well and you can already hear the screech coming alive. Then I start adding distortion. The maximum distortion you can get out of Serum is Zero-Square.

Really important here is that it doesn't matter what you do at this point. You can just be creative and play around. The coolest part happens when you go into your filter. There are two filters in Serum, and with the latest Serum update there's some really cool stuff, like the reverb, all pass and comb filters.

I boost the drive and the comb frequency, and set the cutoff to my liking. Then I add an LFO to the cutoff, because I want it to move around a bit. On the second filter I like to use the reverb filter, with the mix not on 100. It doesn't need to overpower the sound.