Sonnox Restore - Manual (Page 5)

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“Alt Mode” – This allows two different modes for hum removal. Try both modes with the
sensitivity knob, and use the mode that allows the lowest setting of the sensitivity.
“Tone On” – Enables the onboard tone generator which can be useful for finding the frequency
of unusual hums, whines or whistles.
“Tone dB” – Allows you to set the level of the tone generator.
“Fine Adjust” – Sets the Frequency control to have a much finer range so that it is easy to
home into a precise frequency value. Holding down shift while moving the Frequency knob
enables an extreme fine adjust, where the frequency can be accurately determined to 0.0001 Hz.
If Fine Adjust is selected while in Auto tracking mode, the detector is forced into Freeze mode
and the Freeze mode button flashes. Exiting Fine Adjust returns to Auto mode.
“LF”, “MF”, “HF” – These three buttons set which frequency band the big rotary control will
operate over. LF = 20Hz to 160Hz. MF = 160Hz to 1280Hz. HF = 1280Hz to 20kHz. The peak
profile is not active for the HF range.
“Hz”. The Frequency control in the centre is used to set the nominal frequency about which in
Auto mode the detection algorithms hunt for a peak in the peak profile. In Freeze mode it
determines the frequency of the removal filters. The frequency can be selected using the scribble
tab in units of 1Hz (normal), 0.01Hz (Fine adjust) and 0.0001Hz (extreme fine adjust).
Description of Controls – Remove Section
“Comb” – Sets the removal filters to be a comb filter. Comb is best for auto mode, and for when
there are many harmonics in a buzz.
“Para-EQ” – Sets the removal filters to be a narrow notching parametric EQ. You may prefer
the sound of these filters when there are few harmonics.
“+Even” – When using the Para-EQ option, by default even harmonics are not notched out
because frequently they are not present. Enabling this control will notch out even harmonics as
well.
“Range” – This sets the frequency range above which there are no notches. This needs to be as
low as possible to avoid loss of MF and HF information, but high enough to take out all the
harmonics of a buzz.
“Atten” – Set this to the minimum attenuation that will make the hum or buzz inaudible.