[Tokolosh]

But still! Even though it's a repetitive track, the tweaking must've been very tedious.

I don't think it would be possible to reconstruct most, if not all of Autechre's tracks.
They use Max/MSP (which you'd obviously need) + all the unique patches they've designed.
You would then have to arrange and connect everything in the right order and adjust the parameters.
A fucking nightmare!

Imagine Merzbow... :-)