Bit-crushing a sound then bandpass-filtering it turns harsh noise into usable dub texture

A core dub techno sound-design move is deliberately over-degrading a sample, then rescuing it with a filter. Reducing bit depth (e.g. Redux at 6-bit) introduces very harsh digital noise that seems unusable in isolation. Passing that signal through a bandpass filter — a gentle 12 dB/oct slope, cutoff around 450 Hz — cuts the muddy lows and the hyper-noisy highs, leaving a mid-focused, characterful band. Moving the cutoff (optionally with slightly raised resonance, and slow LFO modulation) then sweeps the sound’s character. The general principle transfers beyond dub techno: destructive degradation plus a well-placed bandpass yields textures that would be impossible to synthesize cleanly, and that sit especially well when run through delays.

Examples

Tutorial step 3: Redux at 6-bit -> Auto Filter in bandpass (slope 12, cutoff ~450 Hz, LFO ~10, slow rate) with cutoff automation. Harsh in solo, musical once band-limited and echoed.

Assessment

Take any harsh bit-crushed sound and make it usable with a bandpass filter. Explain why bandpass (rather than low-pass or high-pass) is the right tool here, and what raising resonance and adding LFO contribute.