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how do you make vocals sound demonic in a way, first example i can think of is this tune sort of like pitched down but not...

I think it's all about subtlety. Subtle distortion/bitcrushing and ringmodulation. He also automates everything (especially the wet/dry signal) and pitches up and down.

yeah, try pitching down, maybe vocoder, distortion. in ableton there's a thing called resonator, which i slapped onto a vocal-sample to good effects. just try different things and experiment

Sounds like the vocals are coming across multiple tracks, with the effects stated above. In certain sections in the beginning, it sounds like a vocoder .... But instead of the traditional vocoder effect (Carrier being the vocals, modulator being a synth) it sounds like the vocals are modulating a bass sound of some sort. So you get that deep tone.

y, it rly sounded like some ressenator shit going on...