It’s a little hard to see but if you look at the little track status icons on the left and right sides of the OT’s display you can see that each one has a little S on it which indicates that all tracks are using static machines, which just means that they’re streaming samples from the CF card. So the entire composition is purely composed out of looping audio files that Substan is tweaking and applying FX to with the knobs and scene slider. Simple but effective for that kind of thing. He’s also apparently running the audio into a 1010music bluebox which is probably applying extra reverb.
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