Sonnox Restore - Manual (Page 10)

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7. Once you are happy that you have a sympathetic treatment of the noise, you can then consider
adding some warmth back to the output using the Warmth control.
Quick Start Guide for the Oxford DeNoiser (Complex Noise Removal)
The DeNoiser provides significant ability to vary the shape of the noise threshold profile and the
noise removal. For best results, here are some additional suggestions.
1. For surgical noise removal, set the Reduction slider of the Remove section to 0dB and
activate the yellow reduction bias curve using Bias Select button. This allows the noise
reduction to be modified in smaller frequency bands. Listen to the audio signal, and bring down
the grab handles on the yellow curve. Listen to the removal of noise in that band, and carefully
balance against the preservation of the audio signal.
2. Now listen to the critical frequencies of the material to evaluate whether you could adjust the
red threshold bias curve to be more sympathetic to these parts. This would mean slightly
lowering the threshold bias handles in the critical regions of the frequency spectrum to reduce
noise reduction there and preserve more of the original audio, and perhaps to lift the bias controls
in the HF area to remove more hiss.
3. If you have a constant noise floor, try to find a segment with no signal and use Freeze mode.
All the threshold profile and noise reduction biasing controls will help you modify the curves.
4. Surprisingly good results can be obtained quickly using a manually-shaped fixed curve. Select
Manual mode. Use the Colour control to modify the noise profile at LF, perhaps by mimicking
a pink noise curve. Use the Air control to modify the noise profile at HF, which can help
preserve HF signal frequencies. The noise profile can be further shaped in smaller frequency
bands by using the bias curve handles.