Bypass
Center switch position. Audio passes through unchanged. Use it as the reference for every adjustment.
User guide
Start simple. Let the band tell you what it needs.
QRNix has one mode switch, four controls, and one button. The operating sequence below keeps the first session predictable.
First session
Work from Bypass outward.
- Connect a line-level or controlled headphone source. Start with the radio source level low. The connection guide covers the current input limits.
- Select Bypass. Confirm that you hear normal radio audio before adding processing.
- Set the input level once. Reduce the radio source level if the OLED inverts its mode line (the CLIP indication). Keep that level fixed before capturing a Spectral profile.
- Select a noise-reduction mode. Use Spectral for stable noise or Adaptive for changing conditions.
- Capture the noise profile — Spectral mode only. Tune to an empty frequency and press and hold the button for at least 500 ms — QRNix records one second of input as the noise reference. Adaptive mode does not use a captured profile.
- Start with Reduction at 15 dB. Reduction sets the residual depth; adjust it until the remaining noise sits where you want it.
- Adjust Aggression next. Start low and raise it until static falls, but back off if speech becomes metallic or thin.
- Then add Smoothing and Whitening only when useful. The two controls refine the character of what remains.
Mode switch
Use the mode that matches the noise.
Spectral
Capture one second of representative noise with no wanted voice. Best for stable noise and weak signals. Recapture after retuning or a real noise change. Holding the button also auto-tunes the four controls to that capture.
Adaptive
QRNix updates its noise estimate continuously. Best while tuning or when conditions change faster than a manual capture can keep up. Enter during quiet audio when possible.
Four controls
Know what each adjustment trades.
| Reduction | 0 to 30 dB. Sets how much residual noise is mixed back. It does not decide what is voice or noise. |
|---|---|
| Smoothing | 0 to 100%. Steadies the reference spectrum over time. Higher values can smear fast speech. |
| Whitening | 0 to 100%. Redistributes tonal residue to make it less distracting. Its effect is subtle when Reduction is already high. |
| Aggression | 0.00 to 2.00. Controls oversubtraction. Higher settings remove more noise but can create metallic or musical artifacts. |
Auto-tune
Let QRNix set the controls for you.
Auto-tune runs from Spectral mode. It captures the same one-second noise profile as a normal capture, then searches the four controls for the best match to that noise and locks the result.
- Select Spectral and wait for a noise-only moment. Quiet audio is fine, but wanted voice inside the capture window will be treated as noise.
- Hold the button for at least 500 ms. QRNix captures one second of input. If the input is clipping or too quiet, the tune aborts with a full-screen notice instead of guessing.
- Listen while it searches. The sweep is brief and audible as candidate settings pass through the box.
- Let it lock. The winning values latch and the OLED shows Tuned. Press the button while the tune is running to cancel it and restore the previous settings.
After a tune
The tuned values stay in control even if the knobs move. To take a control back, park its knob at the tuned value for a moment — QRNix hands that parameter to the knob, and it stays manual from then on. When all four have been handed back, the box is fully manual again. Holding the button in Spectral mode clears a latched tune and returns to the manual pots.