More of a collection of effects and noises than anything musical, but I like the tense, sort of sci-fi/horror mood.

Voice 1: I started with A Surge XT Classic VCO going through a ring modulator, both tuned between 20 and 30 Hz, which produced a sort of crackly gowl that sounded good through a resonant bandpass filter. Putting it through a big, spacey reverb made it sound like a radioactive windstorm.

Voice 2: To that, I added a Surge XT Sine VCO with a non-default waveform and lots of feedback, going through a high-pass filter, using an LFO as an envelope and changing the pitch each time it resets.

Voice 3: A basic kick drum with a bit of overdrive and a single echo that goes off sort of randomly. Sort of a heartbeat, or something pounding on the door.

Voice 4: A burst of random pitches from a Venom XM-OP pair with long release tails, going through another reverb and then a Sapphire Echo Delay.

Voice 5: A nasty-sounding bass drone with chorus going through an Ambivalent Synths Granier, with modulation from all the random voltage sources in the patch.