This Ableton tutorial walks through the downsampling section of Redux, Live's device for recreating the gritty character of early digital samplers. The sample rate dial degrades the signal by introducing aliasing: as the rate drops, high frequencies are progressively lost and spectrally shifted copies of the original signal become more prominent, producing that raw, unfiltered resampling texture.
Jitter adds randomized timing variations to the downsampling process, introducing noise and unpredictability on top of the aliasing distortion.
The Pre filter applies an anti-aliasing filter before the effect hits, which changes how the resampling reacts to the frequency content of your source material. The Post filter follows the resampling stage and reduces imaging artifacts, with an adjustable cutoff frequency to shape the result.