manual

334 Audio Plug-ins

Output Level Meter (dB)

The output meter is designed to give exactly 1dB per LED for the top 18dB of dynamic

range, and 2dB per LED thereafter. There is a peak-hold feature that holds the highest

peak, helping to give a better impression of the working dynamic range.

Output Gain Trim Touch Pad (dB)

This allows you to reduce the output level by up to 12dB. Dithering is applied after

output gain control, so it may be necessary to reduce this value by a small amount to

avoid clipping.

Quick-Start Guide for the De-Buzzer

1. Find the nominal frequency. Start with Sensitivity and Attenuation controls at the default

positions (90% and -48dB respectively).

2. If you know the rough frequency of the nominal, select that frequency using either the

knob or by typing into the touch pad.

3. In Auto mode, allow the detector time to drift towards the actual fundamental. The

detect display will indicate conﬁdence of hum detection. Auto mode should be used if

the fundamental drifts over time.

4. Freeze mode should be used to select a speciﬁc frequency that might be variable in

strength. Fine Adjust (which forces freeze mode) can be used to increase the resolution

of selecting the fundamental.

5. If you are still having difﬁculty ﬁnding the fundamental, try using the Tone control.

6. The Hum mode removes harmonics up to 800 Hz. If you can hear harmonics that

are higher in frequency, try selecting Buzz mode, which will remove harmonics up to

4000Hz. If there are no harmonics above 800Hz, be sure to use Hum mode to preserve

as much original audio as possible.

7. Also in order to cause as little damage to the audio as possible, back off the attenuation

until you can just hear the buzz, then increase it a little until the buzz is inaudible.

8. Now reduce the sensitivity until the buzz is just inaudible.

Tip: You can use the high resolution FFT in WaveLab to help identify the exact fundamental

frequency.