Nota Crush
Nota Crush lowers the bit depth and the sample rate: old samplers, game consoles, broken radios, digital destruction.
Signal flow: drive → anti-alias filter → sample & hold (with jitter) → dither → shape → quantise → noise floor → post filter → DC filter → mix → auto gain.
The graphs
Section titled “The graphs”| Tab | What it shows (and what you can drag) |
|---|---|
| Quantiser | The held, quantised steps over a sine — drag up / down for Bits, left / right for Rate |
| Spectrum | The output spectrum, what the crush added, and the images above the reduced Nyquist — drag the Nyquist and filter lines |
| Transfer | The transfer curve — drag for Drive |
Controls
Section titled “Controls”| Control | What it does |
|---|---|
| Mode | Digital (hard truncation), Analog (soft clip) or Fold (wavefolding) |
| Bits · Rate | Bit depth and the reduced sample rate |
| Drive | Input drive |
| Anti-alias | Filters what the reduced rate would fold back — on for smooth, off for harsh aliasing |
| Dither · Jitter · Noise | Grit: dither noise, clock jitter, a noise floor |
| Filter | A post low-pass to tame the top |
| DC filter | Removes any DC offset |
| Wet · Gain · auto gain | Dry / wet, output, and riding the output back to the input’s loudness |
Presets
Section titled “Presets”33 factory presets: lo-fi (Broken Radio, Lo-Fi Warmth, Lo-Fi Tape, Dusty Sampler, SP-1200 Grit, MPC Crunch, Vinyl Dust, Warm 12-Bit), radio (Telephone Line, AM Transmitter, Walkie-Talkie), games (8-Bit Arcade, 4-Bit Handheld, NES Pulse, 16-Bit Console, Game Boy Wave, Speak & Spell), mix (Subtle Air, Parallel Grit, Hi-Hat Sizzle, Drum Bus Dirt), destruction (Digital Grit, 1-Bit Buzz, Aliasing Storm, Broken Clock, Bitrot, Sub Destroyer, Broken Toy) and folding (Folded Crunch, Gentle Fold, West Coast Fold, Metal Fold).