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noiz-box

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NoizBox (distortion effect)

NoizBox is a creative distortion effect consisting of an input filter, a nonlinear wave-shaper, and an output filter, with a Dry/Wet Mix control to adjust the balance between the “dry” unprocessed signal and the “wet” distorted signal at the output.

The GUI consists of three sections, described individually below.

PreFilter section

The PreFilter section of the GUI represents the input (pre-distortion) filter. This is actually a chain or cascade of up to four identical, two-pole recursive digital filters.

  • The left menu allows selecting the filter type:
    • OFF disables the pre-distortion filter block entirely
    • LP: low-pass
    • HP: high-pass
    • BP: band-pass
    • BR: band-reject (aka “notch”)
  • The right menu allows selecting the number of stages in the filter chain:
    • 12 dB: one stage, yielding 12 dB/octave roll-off
    • 24 dB: two stages, yielding 24 dB/octave
    • 36 dB: three stages, 36 dB/octave
    • 48 dB: four stages, 48 dB/octave
  • The three knobs adjust the frequency response and gain of all active stages:
    • The Freq knob adjusts the filter's characteristic frequency (e.g. cutoff or center frequency)
    • The Q knob adjusts the amount of resonance (aka “emphasis”) near the characteristic frequency
    • The Drive knob adjusts the filter's gain. It's called “drive” because it affects how hard the nonlinear waveshaping block is driven.

PostFilter section

The PostFilter section of the GUI represents the output (post-distortion) filter. Like the pre-filter, this is also a chain of up to four cascaded filter sections, and the controls are the same.

The Mix knob adjusts the balance of unprocessed (“dry”) and processed (“wet”) signals in the final output.

  • When the knob is all the way to the left, only the dry signal is heard
  • When the knob is all the way to the right, only the wet signal is heard
  • Intermediate positions set the mix of dry and wet.

Waveshaper (graph) section

noiz-box.1580766019.txt.gz · Last modified: 2023/05/08 18:59 (external edit)