Solidyne HL 202, Руководство пользователя

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How use this control
Increase the threshold raising the NOISE fader until eliminating the
background noise. An insufficient level will do that the noise
remains, although reduced. An excessive level will cause that the
audio appears “intermittent”.
Next some important tips to take in mind when use this control:

If the background noise in the communication is very high,
will be always over the maximum threshold (fader at top)
with which the expander/gate will not work correctly.

Consider that the expander/gate releases whenever the
audio signal is below the threshold. If the background noise
is very variable in level (noise from a street, for example), it
agrees not to use the NOISE CONTROL to avoid that
during the pauses it activates and deactivates generating
an intermittent background sound. In these cases it is
preferred to leave the ambient noise.

Also can happen that the background noise is very
notorious (a strong humming or buzz) and although the gate
can attenuate it during the pauses, the effect “appearance”
and “disappearance” of the noise is more annoying than the
own noise, due to a psychoacoustic phenomenon according
to which the ear “is accustomed” to the floor of constant
noise when concentrating the attention in the word.
According to these advice, the good criterion of the operator will
determine when it will make use of the noise gate and in which
cases it will prefer not to use it.
SOLIDYNE Telephonic Hybrids Page 29