What it is and how it works
Two forms of deliberate digital degradation:
- Bitcrusher (bit reduction): reduces the amplitude resolution. Each bit is worth about 6 dB of dynamic range: 16 bit ≈ 96 dB, 12 bit ≈ 72 dB, 8 bit ≈ 48 dB, 4 bit ≈ 24 dB. With few bits the wave becomes "stepped": quantization noise and distortion appear which, unlike analog noise, is correlated with the signal (grainy, rough) and becomes more evident on soft sounds and tails.
- Decimator (sample rate reduction / sample-and-hold): holds each sample for multiple periods, as if the sample rate were lower. Without an anti-aliasing filter, the frequencies above the new Nyquist (half the new rate) "mirror" downward: metallic inharmonic tones appear, along with a loss of highs. At 22 kHz the sound is only slightly dull; at 8–11 kHz it is "digital telephone"; below 4 kHz it becomes robotic and broken.
These effects recall historic samplers: the E-mu SP-1200 (12 bit, about 26 kHz) is the sound of 1980s–90s hip hop, the Akai S950 and the 12-bit MPCs, 8-bit video game consoles (chiptune).
Parameters one by one
- Bits / Bit depth: 16–12 bit = subtle color ("digital vintage"), 10–8 bit = obvious lo-fi, 6–4 bit = destruction, 1–2 bit = noisy square wave.
- Sample rate / Downsample / Rate: effective rate or division factor.
- Anti-alias / filter: low-pass filter before (less aliasing, more "sampler" sound) or after (softer).
- Jitter / Dither: some plugins add instability or noise for more natural degradation.
- Mix: often 20–60% to keep body and definition.
- Clip / Drive: many crushers saturate too.
Tools
- FL Studio stock: Effector LO-FI (X = decreasing bit depth, Y = decreasing sample rate); Fruity Squeeze (Squarize = bit reduction; Puncher = alternating sample replacement; LP filter pre or post, Mix); Fruity Delay 3 (Samp Rate and Bits in the path; with Delay Model on "Off" the delay is disabled but filter, saturation, limiting, sample rate, bit and tone stay active: it becomes a crusher with a filter); Distructor (Crusher with Rate Crush and Bit Crush; Harmor Bitcrush and Bitjam models).
- Third party: D16 Decimort 2 (emulation of vintage samplers with filters and jitter), TAL-Bitcrusher (free), Kilohearts Bitcrush, iZotope Trash and Vinyl, XLN RC-20 (Digital module), Ableton Redux, Camel Crusher (free, distortion and compression), SketchCassette.
When to use it and on what
- Lo-fi drums, boom bap, jazz-hop: 12 bit and 26–32 kHz on the drum bus or on samples for the SP-1200/MPC aesthetic. Often in parallel.
- Hi-hats and percussion: light crush for grain and "dirt" that makes them stand out.
- Synths and pads: lo-fi texture, 1980s digital, chiptune.
- Vocals: robotic effect, digital radio, "glitch"; automation on single words (throw).
- Bass: crush on a parallel path (filtered above 200 Hz) for digital grit.
- Transitions: automating bits and rate downward before the drop (progressive degradation), "digital tape stop".
- Glitch and IDM sound design: fast modulation of rate and bits.
Starting settings
| Use | Bits | Sample rate | Filter | Mix |
|---|---|---|---|---|
| Boom bap drum bus (SP-1200 style) | 12 | 26–32 kHz | LP 10–12 kHz after | 30–60% |
| Dirty hi-hats | 8–10 | 22 kHz | — | 20–40% |
| Lo-fi pad | 10–12 | 16–22 kHz | LP 6–8 kHz | 50–100% |
| Robotic vocals | 6–8 | 8–11 kHz | BP 300 Hz–4 kHz | 50–100% |
| Chiptune lead | 4–8 | 11–22 kHz | — | 100% |
| Bass parallel path | 8 | 11–16 kHz | HP 200 Hz | 15–30% |
| Transition build-up | 16 → 4 | 44 → 4 kHz | — | automation |
By genre
- Boom bap, lo-fi, jazz-hop: light crush and filters are part of the identity.
- Chiptune, synthwave, hyperpop: low bits and square waves.
- IDM, glitch, breakcore: extreme modulations and automations.
- Trap and drill: crush on hi-hats, samples and transitions.
- Pop: details in automation (single words, intro).
Common mistakes
- Heavy crush on the whole drum kit: the kick loses punch and the sub becomes noise. Do it in parallel or only above 150–200 Hz.
- Unwanted aliasing on the high notes of a synth: use the anti-alias filter or a less extreme rate.
- Quantization noise in tails and silences: add a gate after, or automate the mix.
- Using the bitcrusher on the master to "make it lo-fi": better on the music bus, leaving the vocal cleaner.
How to hear it
- On a hi-hat: go down from 16 to 4 bit and hear how the tail becomes grainy before the attack.
- On a 1 kHz sine wave: lower the rate to 4 kHz and watch the spectrum: mirrors appear at 3 kHz, 5 kHz… (aliasing).
- Compare the drum bus with crush in parallel at 40%: the drums stay full but gain "dust".
Starting settings
| Parameter | Value | Why |
|---|---|---|
| Bits (color) | 12–16 bit | Subtle digital vintage. |
| Bits (lo-fi) | 8–10 bit | Obvious grain. |
| SP-1200-like sample rate | About 26 kHz | Classic hip hop aesthetic. |
| Mix | 20–60% | Body and punch preserved. |
| Anti-alias filter | LP before the decimator | More sampler, less metallic. |
Frequencies to watch
| Range | What to do |
|---|---|
| Below 150–200 Hz | Leave the sub clean: crush the high part or use parallel. |
| Above the new Nyquist | The decimator eliminates these frequencies and mirrors them: loss of highs and metallic tones. |
| 6–12 kHz | Zone where light crush adds grain to cymbals and hi-hats. |
Example chain
| Step | Tool | Settings | Why |
|---|---|---|---|
| EQ / split | Fruity Parametric EQ 2 or Frequency Splitter | Isolate the part above 150–200 Hz | The sub stays clean. |
| Crusher | Effector LO-FI / Fruity Squeeze / Fruity Delay 3 (Model Off) / Distructor Crusher / Decimort 2 | 12 bit, 26–32 kHz | Digital grain. |
| Post filter | Fruity Parametric EQ 2 / Fruity Filter | LP 8–12 kHz | Softens aliasing and noise. |
| Compression/saturation | Fruity Compressor / Soft Clipper | Light GR | Cohesion of the effect. |
| Automation | Automation clip on bits and rate | Drops in build-ups | Transitions. |
How to check the result
- Spectrum: energy above the simulated Nyquist frequency absent and no evident inharmonic peaks in sensitive zones (2–5 kHz), unless intended as an effect.
- Sub (40–80 Hz) unchanged within 1 dB on the drum bus with parallel crush.
- Noise floor in the silences below −60 dBFS (gate or automation if the crush raises it).